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1
Content available remote

Magnetic Force Microscopy Study of Zn_{1-x}Co_{x}O Nanowires Grown by Rapid Thermal Evaporation

100%
Aleszkiewicz M., Fronc K., Aleszkiewicz P., Zaleszczyk W., Dziawa P., Wojciechowski T., Wojtowicz T., Karczewski G.
Acta Physica Polonica A
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2009
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vol. 116
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issue 5
865-867
EN
In this work we studied domain structure of Zn_{1-x}Co_{x}O nanowires which are single arms of tetrapode crystals. The as-grown material exhibits hysteretic behavior even at room temperature as revealed by SQUID mesurements. In order to get insight into the magnetic properties of individual tetrapodes they were dismembered into nanowires of nanometric diameters, deposited on a flat substrate and imaged by magnetic force microscopy. A magnetic interaction between the magnetic force microscopy probe and single nanowires has been detected which confirms that nanometric volume of the material possesses a magnetic moment. The magnetic force microscopy contrast is attractively independent of the tip magnetization direction which indicates that shape anisotropy of nanowires is not strong enough to prevent occurrence of tip-induced magnetic field disturbance.
2
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The Measurement of YBa_2Cu_3O_{7-δ} Single Crystals Using the Atomic/Magnetic Force Microscopy

80%
Kamiński M., Wróblewski M., Susła B.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
91-97
EN
In this paper the experimental investigations of the YBa_2Cu_3O_{7-δ} single crystal, using atomic force microscopy and magnetic force microscopy, are presented. The atomic force microscopy was used to identify oxidized and unoxidized YBa_2Cu_3O_{7-δ} crystal. The YBa_2Cu_3O_{7-δ} single oxidized crystal was examined for magnetic properties by means of magnetic force microscopy. The research was carried out at a room temperature and in the air atmosphere without external magnetic field.
3
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Magnetic Properties of Poly (Divinylbenzene, Ethylene Glycol Dimethacrylate and Vinyl Alcohol) Containing Barium Ferrite Nanoparticles

80%
Gunes S., Akay S., Kara A.
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vol. 125
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issue 2
538-540
EN
Three different kinds of polymer films, poly (divinylbenzene), poly (ethylene glycol dimethacrylate) and poly (vinyl alcohol), containing M-type hexagonal barium ferrites (BaFe12O19) were synthesized on glass substrates by using surface polymerization method. The structural properties were characterized by X-ray diffraction and atomic force microscopy. X-ray diffraction patterns show that polymer films have a polycrystalline structure. The magnetic measurement of polymer films were examined at room temperature using vibrating sample magnetometer and magnetic force microscopy, respectively. The magnetic measurements indicate that P(VA)-BF films exhibit higher saturation magnetization and coercive field than P(EGDMA)-BF and P(DVB)-BF films.
4
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Nanoscopic Investigation of Magnetic Thin Films by Means of Magnetic Force Microscopy Technique

80%
Sikora A., Ozimek M., Wilczyński W.
Acta Physica Polonica A
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2016
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vol. 129
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issue 6
1226-1229
EN
In the article the results of the research aimed at the recognition of the correlation between the Ni-Fe film thickness and its magnetic domain structures are described. Magnetic thin films were prepared by pulse magnetron sputtering. Obtained thin film thicknesses were in the range of 47.6-326.0 nm. Magnetic domain structures were imaged using magnetic force microscopy. In order to obtain quantitative description of magnetic domains images, the algorithms designed for topography parameters determination were applied, enabling the comparison of specific factors related to the magnetic properties of the samples. Utilized approach provided the analysis of the impact of sputtering parameters on the morphological and magnetic properties of obtained films.
5
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Magnetic Features at the Surfaces of Nanocrystalline Ribbons

70%
Miglierini M., Šafářová K.
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issue 5
840-842
EN
Magnetic behaviour of Nanoperm Fe_{90}Zr_7B_3 nanocrystalline alloy is studied by surface sensitive techniques comprising atomic force microscopy and magnetic force microscopy. Correlation of structural arrangement and magnetic order including the orientation of net magnetization is obtained by the help of the Mössbauer spectrometry. As-quenched amorphous alloys show no magnetic features. After annealing, maze magnetic domains have developed. Their shape is governed by surface crystallization. Position of net magnetization out of the ribbon plane by about 26° was determined by the Mössbauer spectrometry.
6
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The Surface and Bulk Magnetic Properties of Fe-Al Alloys

70%
Hendrych A., Životský O., Jirásková Y., Maťko I.
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vol. 126
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issue 1
58-59
EN
The present paper is devoted to Fe-Al alloys with aluminium content of 28, 33 and 35 at.%, prepared by standard technological procedure. The attention is focused on the comparison of the surface and bulk magnetic properties, which were obtained by magneto-optical Kerr effect (MOKE) and atomic and magnetic force microscopy (AFM/MFM) as the surface-sensitive methods combined with the vibration sample magnetometer (VSM) yielding the bulk magnetic properties. As was expected, the Fe_{72}Al_{28} sample shows an overall ferromagnetic behavior at room temperature. Nevertheless, the bulk hysteresis loop shows single-phase behavior, while the surface MOKE hysteresis loop consists of two overlapped curves characterized by different coercivity values. The other two samples are paramagnetic from the viewpoint of the bulk, but reveal ferromagnetic behavior of their surfaces, represented by hysteresis loops, corresponding to rather harder magnetic phase. These results are well supported by MFM.
7
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Content available

70%
Kwiatkowski A., Borysiuk J., Bożek R., Wasik D., Kamińska M., Sadowski J., Twardowski A.
Acta Physica Polonica A
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2006
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vol. 110
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issue 2
233-236
EN
We report on cross-sectional transmission electron microscopy and magnetic force microscopy studies performed on self-organized MnAs nanoclusters embedded in GaAs. It was found that 10÷20 nm large MnAs ferromagnetic nanocrystals were formed during rapid thermal annealing of Ga_{1-x}Mn_xAs layers at 600ºC, leading to magnetic contrasts in magnetic force microscopy images.
8
Content available remote

Mössbauer and MFM Investigations of Surface Magnetism in NANOPERM Nanocrystalline Alloys

70%
Miglierini M., Pavúk M.
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vol. 126
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issue 1
124-125
EN
Structurally different surface regions are identified at both sides of the ribbon-shaped ^{57}Fe_{90}Zr_{7}B_{3} NANOPERM alloy. Though paramagnetic in the as-quenched state, the air side shows significant contribution of crystalline bcc-Fe that decreases towards the interior of the ribbon. After annealing at 480 °C, magnetic dipole interactions develop that are associated with enhanced number of ferromagnetic nanograins. Significant increase in the number of nanograins was revealed at the wheel side, while the one at the air side is almost saturated. The observed maze-type magnetic domains exhibit well developed structure with equally wide strips.
9
Content available remote

Magnetic Hyperfine Fields of Nanoperm Alloys

70%
Miglierini M., Kohout J., Lančok A., Šafářová K.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1263-1265
EN
Magnetic hyperfine fields of Fe_{90}Zr_7B_3 Nanoperm nanocrystalline alloy are characterized by ^{57}Fe Mössbauer spectrometry and ^{57}Fe NMR as well as by magnetic force microscopy. ^{57}Fe NMR enables to distinguish a broad signal of iron atoms located in a residual amorphous matrix from a narrow one which belongs to Fe in nanograins. The former coincides with the distribution of hyperfine fields obtained from ^{57}Fe Mössbauer spectroscopy. In addition, it is possible to make a distinction between NMR signals of the Fe nanograins located in magnetic domains from that of the nanograins positioned in domain walls. This is confirmed by magnetic force microscopy where appearance of maze-domains is observed.
10
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High Resolution Tips for Switching Magnetization MFM

61%
Precner M., Fedor J., Tóbik J., Šoltýs J., Cambel V.
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vol. 126
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issue 1
386-387
EN
Switching magnetization magnetic force microscopy (SM-MFM) is based on two-pass magnetic force microscopy with opposite orientation of tip magnetization between two scans. The sum of the scanned data with reversed tip magnetization depicts local van der Waals forces, and their difference maps the local magnetic forces. Tip magnetization can be easily reversed in external magnetic field during the scanning. The separation of the forces mapped enables scanning in close proximity of the sample (~5 nm). Therefore, extremely high spatial resolution (10 nm) is achievable by the SM-MFM. Image phase resolution of the MFM method depends on various geometric parameters of the tip, such as tip length, its apex radius and taper angle. The parameters are determined by the evaporation process, within which the standard atomic force microscopy tips are coated with magnetic layer. In this work we show that the thickness of the coated layer is important for the SM-MFM spatial resolution.
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