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  1. 52 Acta Physica Polonica A

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  1. 6 Nabiałek M.

  2. 6 Pawlik K.

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1
Content available remote

Magnetic Properties of GdMn_{x}Fe_{1-x}Si intermetallic Compounds

100%
Nikitin S. A., Ivanova T. I., Tskhadadze I. A.
Acta Physica Polonica A
|
1997
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vol. 91
|
issue 2
463-466
EN
Magnetic properties of GdMn_{x}Fe_{1-x}Si (x = 1, 0.9, 0.8, 0.7, 0.6, 0) compounds were investigated. Both GdMnSi and GdFeSi crystallize in the CeFeSi-type tetragonal structure and form a complete solid solution without any change in the crystal structure. Magnetic measurements were made in static magnetic fields up to 1 MA/m in the temperature range from 77 K to 420 K. For GdFeSi these measurements were carried out on single crystal sample. It was found that the increase in Fe content leads to a sharp decrease in saturation magnetic moment. The Curie temperature increases in the concentration range 0.7 ≤ x ≤ 1 and monotonously decreases for x ≤ 0.6. These effects could be explained by strong dependence of the exchange integrals on the interatomic distances.
2
Content available remote

Pressure Effect on Magnetic Properties of UGa_{3}

63%
Grechnev G., Delin A., Eriksson O., Johansson B., Panfilov A., Svechkarev I., Kaczorowski D.
Acta Physica Polonica A
|
1997
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vol. 92
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issue 2
331-333
EN
The magnetic susceptibility, χ, of the itinerant antiferromagnetic compound UGa_{3} was studied under pressure up to 2 kbar in the temperature range 64-300 K. The measured pressure derivative of the Néel temperature is found to be dT_{N}/dP=-1.1 K/kbar. In order to analyze the experimental magnetovolume effect values, d lnχ/d lnV, the volume dependent electronic structure of UGa_{3} has been calculated ab initio in a paramagnetic phase by employing a relativistic full-potential linear muffin tin orbital method and including an external magnetic field self-consistently. The calculations revealed a predominance of itinerant uranium f-states at the Fermi energy, as well as a large orbital contribution to χ.
3
Content available remote

Spin-Glass Behavior in LaCu₄Mn Compound

63%
Synoradzki K.
Acta Physica Polonica A
|
2017
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vol. 131
|
issue 4
1024-1026
EN
The experimental results of the X-ray powder diffraction, magnetic susceptibility, electrical resistivity, and specific heat measurements of the LaCu₄Mn compound are presented. LaCu₄Mn is an intermetallic compound that crystallizes in the hexagonal CaCu₅-type structure (space group P6/mmm, No. 191), where the atoms on the 3g (1/2, 0, 1/2) site create a kagome lattice, which can cause the spin frustration and leads to a variety of interesting states of matter, such as spin-ice, spin-liquid, and spin-glass states. The Rietveld refinement reveals a random distribution of Mn and Cu atoms on the 3g and 2c site, where about 80% of Mn atoms occupy the 3g site. The lattice parameters are a=5.252(1) Å and c=4.176(1) Å. The low-field zero-field-cooled and field-cooled DC magnetic susceptibilities show splitting below the spin freezing temperature T_f ≈33 K. At 2 K the magnetization M(H) exhibits hysteresis with coercivity field of ≈5 kOe. The AC susceptibility measurements exhibit a frequency-dependent cusp, associated with a frequency-dependent freezing temperature. Moreover, there is no clear sign of long range magnetic order in specific heat and resistivity measurements.
4
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Magnetic Properties and Phase Constitution of the Nanocrystalline (Nd_{10}Fe_{67}B_{23})_{100-x}Nb_{x} (where x=1, 2, 3, 4) Alloy Ribbons

63%
Kaźmierczak M., Pawlik K., Pawlik P., Gębara P., Przybył A., Wysłocki J.
Acta Physica Polonica A
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2015
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vol. 128
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issue 1
91-93
EN
In the present work the magnetic properties and phase constitution of (Nd_{10}Fe_{67}B_{23})_{100-x}Nb_{x} (where x=1, 2, 3, 4) alloys in a form of ribbons were investigated. The ribbon samples were obtained by controlled atmosphere melt-spinning technique. In order to generate the nanocrystalline microstructure, ribbons were annealed at various temperatures (from 923 K to 1023 K) for 5 min. Subsequent annealing resulted in an evolution of the phase constitution accompanied by a change of their magnetic properties. The X-ray diffraction studies show presence of hard magnetic Nd_{2}Fe_{14}B, paramagnetic Nd_{1+ε }Fe_{4}B_{4} and ferromagnetic metastable Nd_{2}Fe_{23}B_{3} phases. The best hard magnetic parameters were measure for annealed ribbons of the (Nd_{10}Fe_{67}B_{23})_{96}Nb_{4} alloy.
5
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The Effect of Annealing Temperature on the Phase Constitution and Magnetic Properties of the Pr₈Dy₁Fe₆₀Co₇Mn₆B₁₄Zr₁Ti₃ Alloy Ribbons

63%
Przybył A., Pawlik K., Pawlik P., Gębara P., Kaszuwara W., Wysłocki J., Filipecka K.
Acta Physica Polonica A
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2015
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vol. 128
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issue 1
94-97
EN
Melt-spun ribbons were produced from the Pr₈Dy₁Fe₆₀Co₇Mn₆B₁₄Zr₁Ti₃ base alloy at the surface velocity of the cooper wheel of 30 m/s. The studies showed amorphous structure of ribbons and their soft magnetic properties. X-ray diffraction was used to determine phase constitution of all obtained samples. Annealing of ribbons caused formation of nanocomposite structure, which was a result of coexistence of hard magnetic RE₂(Fe,Co)₁₄B and soft magnetic α-Fe phases. Basic magnetic properties such as: coercivity _{J}H_{c}, remanence J_{r} and maximum energy product (BH)_{max} were determined from the measured hysteresis loops. The microstructure of selected specimens was observed by transmission electron microscopy technique.
6
Content available remote

Magnetic Behaviour of U_{1-x}Dy_{x}Ni_{5} Systems

63%
Lucaci P., Lupsa I., Burzo E.
Acta Physica Polonica A
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1996
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vol. 90
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issue 3
565-568
EN
The magnetic properties of (U_{1-x}Dy_{x})Ni_{5} compounds were studied in the temperature range 2-800 K and fields up to 7 T. The compounds having x ≥ 0.2 are magnetically ordered. Above the Curie points, the reciprocal susceptibilities follow a modified Curie-Weiss behaviour. UNi_{5} is a paramagnet. A peak in the temperature dependence of the magnetic susceptibility is evidenced at T ≈ 20 K. For T > 140 K the UNi_{5} susceptibility is temperature independent.
7
Content available remote

Evidence of the Non-Magnetic Ordering in TmRu₂Si₂ at Low Temperatures

63%
Szytuła A., Hoser A., Baran S., Penc B.
Acta Physica Polonica A
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2016
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vol. 130
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issue 6
1371-1372
EN
The neutron powder diffraction measurements of the TmRu₂Si₂ compound in the temperature range 0.47-2.5 K have been performed. The obtained results confirm that this compound in low temperature has a tetragonal ThCr₂Si₂-type crystal structure (space group I4/mmm). The long range magnetic ordering was not detected up to 0.47 K.
8
Content available remote

Electronic, Magnetic and Transport Properties of YCo_{3}B_{2} Compound

63%
Kowalczyk A., Jezierski A., Smardz L., Baszyński J.
Acta Physica Polonica A
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2000
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vol. 97
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issue 5
803-806
EN
We studied the electronic, magnetic and transport properties of the hexagonal YCo_{3}B_{2} compound. The electronic structure was studied by X-ray photoemission spectroscopy and ab initio self-consistent tight binding linear muffin tin orbital method. We found a good agreement between the experimental X-ray photoemission spectroscopy valence band spectra and theoretical calculations. Theoretical calculations showed that the YCo_{3}B_{2} is a paramagnet in agreement with experimental results. Electrical resistivity at low temperatures shows a T^{2} dependence, implying that the scattering by the spin fluctuactions is dominant in this temperature range.
9
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Magnetic Interactions between Nanoparticles Formed during Calcination of Ferrihydrite

63%
Schneeweiss O., David B., Žák T., Filip J., Tuček J., Zbořil R., Mašláň M.
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|
issue 5
749-750
EN
Magnetic interactions between nanoparticles of magnetite Fe_3O_4 and α-Fe formed during calcination of ferrihydrite in H_2 at temperatures 533 ÷ 713 K were studied. The detailed phase analysis describes evolution of contents of magnetite and α-Fe. Explanation of an anomalous course of magnetic moment characterized by a local maximum at an early stage of formation of nanoparticles is discussed.
10
Content available remote

Neutron Diffraction Studies of PrNi₅Sn

63%
Penc B., Hoser A., Szytuła A.
Acta Physica Polonica A
|
2016
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vol. 129
|
issue 3
313-314
EN
Powder neutron diffraction measurements of PrNi₅Sn performed in the temperature range 1.5-76 K indicate that the compound crystallizes in a hexagonal CeNi₅Sn-type crystal structure (space group P6₃/mmc). The a lattice parameter and the unit cell volume V increase while the c lattice parameter does not change with increasing temperature. No long range magnetic ordering was detected down to 1.5 K, in contradiction to bulk magnetometric results.
11
Content available remote

Multiband s-f Model for Pseudobinary Intermetalic Gd(Al_{1-x}Me_{x})_{2} Alloys. II. Me=Pb, Bi, Si, Sb

63%
Matlak M., Zieliński J.
Acta Physica Polonica A
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1991
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vol. 79
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issue 5
717-719
EN
With the use of the formulae derived in the preceding paper we calculate the Curie temperature and the magnetic moment as functions of the concentration x for Gd(Al_{1-x}Me_{x})_{2} (Me = Pb, Bi, Si, Sb) alloys. The agreement with the recent experimental data is relatively good.
12
Content available remote

Exchange Coupling in GdM Compounds

63%
Buschow K. H. J., Grechnev G. E., Hjelm A., Kasamatsu Y., Panfilov A. S., Svechkarev I. V.
Acta Physica Polonica A
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1997
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vol. 92
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issue 2
267-270
EN
The magnetic susceptibility of ferromagnetic GdM alloys (M=Cu_{1-x}Ga_{x}, Mg, Zn) has been investigated under helium gas pressure for temperatures above T_{C}. The evaluated pressure derivatives of the paramagnetic Curie temperature, dlnΘ/dP, appeared to be remarkably different for isovalent GdMg and GdZn compounds (-11.2 and -0.1 Mbar^{-1}, respectively). An analysis of the obtained dlnΘ/dP values for GdCu_{1-x}Ga_{x} alloys and results of ab initio electronic structure calculations have revealed the essential role of 5d electrons as the mediators of exchange coupling in ferromagnetic GdM compounds. The pressure derivatives of T_{C} were calculated by employing the modern mean-field theory, as well as the spin-fluctuation model. As a result, good agreement is found with the experimental values of dlnΘ/dP.
13
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Magnetic and Structural Characterization of Nickel and Iron Based Heusler Ribbons Ni₂FeZ (Z = In, Sn, Sb)

63%
Frol'ová L., Ryba T., Vargová Z., Komanický V., Kováč J., Gyepes R., Varga R.
Acta Physica Polonica A
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2017
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vol. 131
|
issue 4
735-737
EN
Comparison of structural, chemical, and magnetic properties of Ni₂FeZ (Z = In, Sn, Sb) Heusler ribbons produced by melt-spinning method is presented. The aim of work was to prepare the Heusler alloys with the appropriate chemical composition in a single step without additional thermal treatment. Scanning electron microscopy analysis revealed polycrystalline structure of all samples. It is shown that correct L2₁ structure of Ni₂FeSb can be obtained in a single production step. On the other hand, no Heusler L2₁ phase (nor its variants) occur in Ni₂FeSn alloy. Additionally, magnetic characterization revealed high Curie temperatures of the Heusler phases (above 600 K for Ni₂FeSb and 800 K for Ni₂FeIn).
14
Content available remote

Presence of Parimagnetism in Ho(Co_{1-x}Si_{x})_{2} Under Hydrostatic Pressure

63%
Valenta J., Prchal J., Kratochvílová M., Míšek M., Sechovský V.
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|
vol. 126
|
issue 1
406-408
EN
A new configuration of cobalt magnetic moments with respect to rare-earth ones on local level, named as parimagnetism, surviving above the Curie temperature was determined few years ago for ErCo_{2}. Occurrence of parimagnetism has recently been confirmed also for HoCo_{2}. In this paper we present results manifesting considerable composition and hydrostatic-pressure influence on characteristic temperatures of magnetism in Ho(Co_{1-x}Si_{x})_{2} compounds and draw a preliminary scenario analyzing the exchange interactions involved.
15
Content available remote

Magnetic Properties and Structure of Non-Oriented Electrical Steel Sheets after Different Shape Processing

63%
Bulín T., Švábenská E., Hapla M., Ondrůšek Č., Schneeweiss O.
|
EN
Non-oriented electrical steel sheets are the most often used materials in electrical rotary machines. Raw sheets must be formatted by various methods, e.g., punching, laser, spark or water stream cutting. Basic parameters of magnetic, electrical, and mechanical properties of the sheets are usually obtained from the producer, but namely magnetic properties are changed in dependence on additional machining processes. The aim of this study is to describe changes in magnetic properties after punching, laser or spark cutting of the original sheets M470-50A. The basic information about the structure of the cut edges of samples was obtained by optical microscopy and scanning electron microscopy. For the magnetic measurements toroidal samples were prepared by the mentioned technologies. The magnetic parameters were yielded from the measuring of magnetic hysteresis loops in dependence on saturation fields. The results are discussed from the point of view of applied cutting methods with the aim to obtain the best magnetic parameters and consequently determining the depth of the influenced material. After laser cutting, important decrease in remanence and increase in total losses were observed in comparison with the punched samples.
16
Content available remote

Neutron Diffraction Studies of NdNi_5Sn Compound

63%
Penc B., Baran S., Hoser A., Romaka L., Szytuła A.
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|
vol. 126
|
issue 3
772-774
EN
The neutron powder diffraction measurements of the NdNi_5Sn compound have been performed. The obtained results indicate that this compound crystallizes in a hexagonal CeNi_5Sn-type crystal structure described by the space group P6_3/mmc. The parameters of the crystal structure at 1.55 and 14.8 K are determined. In contradiction to the magnetic data the long-range magnetic ordering was not detected up to 1.55 K.
17
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Magnetism in RCo_{2} (R = Dy, Ho, Er, Tm) Under Hydrostatic Pressure

63%
Prchal J., Šebesta J., Valenta J., Míšek M., Turčinková D., Lapčák L., Prokleška J., Kratochvílová M., Sechovský V.
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vol. 126
|
issue 1
288-289
EN
The short-range parimagnetic configurations, observed in the heavy rare-earth RCo_{2} compounds in paramagnetic range far above the Curie temperature T_{C}, consist in formation of ferromagnetic cobalt clusters antiferromagnetically coupled to the neighboring R magnetic moments. The characteristic temperature of the onset of parimagnetism T_{f} is very sensitive to changes of external conditions like pressure or composition. The pressure coefficients ∂T_{f}/∂p and ∂T_{C}/∂p are comparable, indicating a close connection of underlying mechanisms. Our recent measurements indicate systematic evolution of the pressure coefficients with spanning the rare-earth series from Dy through Tm in RCo_{2} with a specific case TmCo_{2}.
18
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Influence of Microstructure Evolution on the Coercive Forces in Low Silicon Non-Oriented Steels

51%
Petryshynets I., Kovac F., Stoyka V., Boruta J.
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issue 5
1013-1014
EN
The magnetic properties and their dependence on the peculiarity of microstructure in low silicon non-oriented electrotechnical steels were studied in the present work. The estimation of dc magnetic properties of electrical steels was carried out by measurements of coercive forces. It was shown that the coercive force change in silicon steels is dependent on change of average grain size, crystallographic texture and homogeneity of microstructure of the materials. It was revealed that the steels possessing columnar or huge grained microstructure had the lowest measured values of coercive forces. The materials with such microstructure are characterized by a domination of (100) 〈0vw〉 crystallographic orientation.
19
Content available remote

Preferentially Oriented Growth of L1₀ FePt on Si Substrate

51%
Kaushik N., Sharma P., Tanaka S., Makino A., Esashi M.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
611-613
EN
Tilting the magnetic easy axis of L1₀ FePt and/or introducing a magnetic buffer layer is most effective in realizing the L1₀ based magnetic recording media. Here we report on preferentially oriented growth of L1₀ FePt with tilted magnetic easy axis. FePt films of thickness up to 170 nm were deposited on Si substrate with a soft magnetic underlayer of glassy FeSiB, FeSiBP and CoFeTaB. Effects of processing conditions on the structural and magnetic properties were studied. A polycrystalline growth of FePt (i.e. mixed orientation) was observed with the underlayer of FeSiB and FeSiBP, but CoFeTaB promotes preferentially oriented growth along (111) crystallographic direction. Compared to FePt films grown on Si substrate, coercivity (H_{c}) reduces significantly with the introduction of soft magnetic underlayer. The magnetic easy axis of (111) L1₀ FePt is tilted 36 out of plane and it is very promising for tilted magnetic recording media.
20
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Content available

Nanocrystalline Materials: Interfaces and Mesoscopic Correlations Studied by Neutron Scattering

51%
Stuhr U., Wagner W., Kohlbrecher J., van Swygenhoven H.
Acta Physica Polonica A
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2002
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vol. 102
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issue 1
109-122
EN
Nanocrystalline materials can exhibit properties which are considerably different from their coarse-grained counterparts, making them unique for basic or applied research and also very promising for potential applications. The topics which are addressed in the present paper are magnetic properties and magnetic correlations on the nanometer scale, mechanical properties, in particular the influence of grain boundaries on the elastic and plastic behaviour, and vibration modes of grain boundary atoms in nanostructured materials.
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