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1
Content available remote

Interval Computations of Ferromagnetic Resonance Conditions in Exchange-Biased Bilayers

100%
Gutowski M., Żuberek R.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
390-392
EN
The main purpose of this paper is to promote the use of interval calculus in physics. As an example we use the system consisting of two thin films, one ferromagnetic and another one antiferromagnetic, deposited one atop of the other. We successfully and accurately simulate the positions of resonance fields of such a system, as seen in ferromagnetic resonance experiment. Interval calculations have revealed the presence of 1, 2 and sometimes even 4 distinct equilibrium configurations of the system, all corresponding to the same resonance field, when the field has a component antiparallel to that of cooling field, while only 1 such position when it points in the opposite direction. In both cases only a single resonance line is observed. As an added value we show that the exchange-biased system is in the metastable state, out of true thermodynamical equilibrium.
2
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Surface Magnetostriction

100%
Szymczak H., Żuberek R.
Acta Physica Polonica A
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1993
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vol. 83
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issue 5
651-659
EN
Experimental and theoretical research on magnetostriction of nanoscale magnetic multilayers is reviewed. The importance of interfaces and the occurrence of the surface magnetostriction is emphasized. It is shown that the dependence of magnetostriction on the magnetic layer thickness is due to the magnetostrictive strains localized at the interface.
3
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Magnetic Anisotropy and Magnetostriction Oscillations in Magnetic Multilayers

81%
Szymczak H., Żuberek R., Stobiecki F.
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vol. 96
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issue 3-4
495-499
EN
Interlayer pseudodipolar coupling between two ferromagnets separated by nonmagnetic spacer is analyzed. It was shown that this type of interaction should induce magnetic anisotropy and magnetostriction oscillations. It was also predicted that both magnetic anisotropy and magnetostriction decrease with an increase in the spacer thickness. This effect was observed in [permalloy/Cu]_{100} multilayers.
4
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Dipolar Contributions to Magnetoelastic Energy of Crystal Grains with Interfaces

81%
Szumiata T., Żuberek R., Szymczak H., Gonzalez J.
Acta Physica Polonica A
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2000
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vol. 97
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issue 3
531-534
EN
The magnetic anisotropy and magnetostriction in nanocrystalline grains in non-magnetic or magnetic matrix (nanoparticles or nanocrystalline materials) differ from their bulk properties. The interactions between atoms at the interface play the important role in these magnetic properties. In this paper the magnetic dipolar contribution to magnetostriction energy has been calculated for spherical crystal grains (of bcc and fcc symmetry) with interface layer of atoms possessing different magnetic moment. Total magnetoelastic energy of the sphere-interface system is a sum of magnetoelastic energy of the sphere, energy of the interactions between the sphere and the interface and also the energy of the interface. It was shown that magnetoelastic energy depends on the sphere size and interface thickness.
5
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Dependence of the SWR Linewidth on the Wavevector in Amorphous Thin Films

81%
Maksymowicz L. J., Iskhakov R. S., Temple D., Żuberek R., Department od Physics and Electron Technology I. o. E., USSR Academy of Sciences P. I. K., Institute of Physics P. A. o. S.
Acta Physicae Superficierum
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1990
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vol. 1
EN
Work supported in part by the Central Research Project 01.08.B.
6
Content available remote

Joule Heating Preannealing Effect in the Coercivity Field and Magnetostriction Constant of Co_{66}Fe_{4}Mo_{2}Si_{16}B_{12} Alloy

81%
Garcia Tello P., González J., Blanco J., Żuberek R.
Acta Physica Polonica A
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2000
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vol. 97
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issue 3
595-598
EN
The effect of thermal treatments (by the Joule heating and conventional annealing) on the coercivity and saturation magnetostriction constant in the amorphous and nanocrystalline Co_{66}Fe_{4}Mo_{2}Si_{16}B_{12} alloy is reported. It is noticeable the near insensibility to the external stress of coercive field and anisotropy field (leading to extremely low value of magnetostriction 1.5×10^{-8}) achieved after the Joule heating by two steps (first one to relax the internal stresses and the second one to develop a fine nanocrystalline structure).
7
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Surface Magnetostriction within Néel's Model

81%
Żuberek R., Żymierska D., Szymczak H.
Acta Physica Polonica A
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1994
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vol. 85
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issue 2
439-442
EN
The aim of the present paper is to determine the surface magnetostriction in the spirit of Néel's model of the surface magnetic anisotropy. Calculations have been performed for bcc and fcc ferromagnetic crystals.
8
Content available remote

Interval Identification of FMR Parameters for Spin Reorientation Transition in (Ga,Mn)As

62%
Gutowski M., Stefanowicz W., Proselkov O., Sawicki M., Żuberek R., Sadowski J.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1228-1230
EN
In this work we report results of ferromagnetic resonance studies of a 6% 15nm (Ga,Mn)As layer, deposited on (001)-oriented GaAs. The measurements were performed with in-plane oriented magnetic field, in the temperature range between 5 K and 120 K. We observe a temperature induced reorientation of the effective in-plane easy axis from [\overline{1}10] to [110] direction close to the Curie temperature. The behavior of magnetization is described by anisotropy fields, H_{eff} (=4π M-H_{2⊥}), H_{2∥}, and H_{4∥}. In order to precisely investigate this reorientation, numerical values of anisotropy fields have been determined using powerful - but still largely unknown - interval calculations. In simulation mode this approach makes possible to find all the resonance fields for arbitrarily oriented sample, which is generally intractable analytically. In "fitting" mode we effectively utilize full experimental information, not only those measurements performed in special, distinguished directions, to reliably estimate the values of important physical parameters as well as their uncertainties and correlations.
9
Content available remote

Temperature Dependence of Exchange Anisotropy of FeNi/FeMn Bilayers

62%
Żuberek R., Gutowski M., Szymczak H., Gnatchenko S., Merenkov D., Bludov A., Verkin B.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
167-170
EN
The influence of the bilinear and biquadratic coupling on the exchange anisotropy of the ferromagnetic/antiferromagnetic bilayer was studied by variable angle and temperature dependent ferromagnetic resonance. From the angular dependence of the resonance field the bilinear and biquadratic exchange coupling constants were determined.
10
Content available remote

Mössbauer Study of Magnetic Properties of Fe_{80-x}Co_{x}Zr_7Si_{13} (x = 0-30~at.%) Boron-Free Amorphous Alloys

62%
Kopcewicz M., Grabias A., Latuch J., Ferenc J., Żuberek R., Nesteruk K.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1257-1260
EN
Amorphous Fe_{80-x}Co_{x}Zr_7Si_{13} (x = 0-30 at.%) alloys in which boron was completely replaced by silicon as a glass forming element have been prepared by melt quenching. Partial substitution of iron by cobalt caused the increase of the hyperfine field and saturation magnetization. The specialized rf-Mössbauer measurements revealed that all amorphous alloys studied are magnetically very soft. The rf-sidebands effect, related to magnetostriction, increases with the increase of Co content. In Fe_{50}Co_{30}Zr_7Si_{13} sample the rf field exposure induced partial crystallization of amorphous phase that was attributed to mechanical deformations related to high frequency magnetostrictive vibrations induced by the rf field. The measurements of the hysteresis loop revealed that coercivity increases for higher Co content.
11
Content available remote

Thermal Evolution of Magnetic Interactions in Ni Nanowires Embedded in Polycarbonate Membranes by Ferromagnetic Resonance

52%
Ghaddar A., Gieraltowski J., Gloaguen F., Żuberek R., Aleshkevych P., Kazmierczak J., Slawska-Waniewska A., Szymczak H.
Acta Physica Polonica A
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2009
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vol. 116
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issue 6
1039-1043
EN
Ni polycrystalline nanowires with diameters of 50, 80, and 100 nm were electrodeposited in cylindrical pores of track-etched polycarbonate membranes. Their magnetic properties were determined as a function of temperature using ferromagnetic resonance and magnetization measurements. At room temperature, the uniaxial anisotropy is equal to the shape anisotropy whereas an additional contribution is evidenced at low temperature. This additional contribution is attributed to magnetoelastic effects induced in the nanowires due to the different thermal expansion constants of Ni and polycarbonate. The analysis of magnetization processes in Ni nanowire arrays evidenced strong dipolar interactions inside the wires due to the domain structure. The coercive field of the nanowires was shown to be nearly a linear function of the temperature and could be accounted for temperature dependence of the uniaxial anisotropy.
12
Content available remote

The Influence of Annealing Temperature on Magnetic Properties of Vitrovac 6030

52%
Lachowicz H., Popławski F., Żuberek R., Kulik T., Ślawska-Waniewska A., Kuźmiński M., Yu S., Dynowska E.
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vol. 96
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issue 3-4
483-494
EN
Co-Fe-Mo-Mn-Si-B metallic glass ribbon (Vitrovac 6030) was subjected to the isothermal annealing at temperatures in the range 523-873 K so as to produce a series of samples with gradually coarser microstructure. For this series of samples a giant increase in the coercivity, exceeding three orders of magnitude, is observed. This increase is interpreted in terms of the strengthening of the pinning effect of the nanocrystalline structure on the moving domain walls. It is shown that the anisotropy of the created crystallites is mainly responsible for the increase in the pinning force since the effective anisotropy seen by the wall becomes larger and larger with the gradual increase in the density and size of the grown particles.
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