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Magnetization Reversal Phenomena and Domain Wall Behaviors in Nanostructured Magnetic Systems

100%
Shinjo T.
Acta Physica Polonica A
|
2002
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vol. 102
|
issue 1
147-156
EN
Several recent experiments on micro- (or nano-) structured samples of ferromagnetic materials are introduced. Magnetization reversal phenomena are investigated on submicron wire samples of trilayer structure using the giant magnetoresistance effect. Domain wall movements are sensitively monitored by resistivity measurements and the velocity of propagation is determined. The contribution of domain wall to the resistivity is argued from the results on artificially designed samples of a spring-magnet system. In circular dots of permalloy, the existence of vortex magnetization is confirmed and the reversal of the vortex core magnetization is studied from magnetic force microscopy measurements.
2
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Magnetic Anisotropy in Co/Nd Multilayers with Depth-Selectively Inserted ^{57}Fe Probe Layer

51%
Baczewski L., Mibu K., Nagahama T., Shinjo T.
Acta Physica Polonica A
|
2000
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vol. 97
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issue 3
439-442
EN
Multilayers of Co/Nd with probe layer of 2 Å of ^{57}Fe evaporated in UHV conditions were studied by means of vibrating sample magnetometry and Mössbauer spectroscopy at T = 4.2 K. Isomer shift, hyperfine field distribution and direction was obtained from the Mössbauer data computer fitting. Magnetic anisotropy was studied and discussed. The easy magnetization direction was close to the perpendicular direction for both samples but the tendency to perpendicular anisotropy was stronger when the Fe probe layer was placed in the vicinity of Co/Nd interface.
3
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Magnetism and Magnetoresistance of Multilayers Prepared on Microstructured Substrates

51%
Shinjo T., Ono T., Shigeto K., Sugita Y.
Acta Physica Polonica A
|
1997
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vol. 91
|
issue 1
27-36
EN
Magnetic multilayers with a new type of structural modification were prepared by ultrahigh vacuum deposition onto substrates with V-shaped microgrooves and used as the samples for the following two novel studies: One is the study of giant magnetoresistance in a new geometry, CAP, where the electric current is at a certain angle to interfaces. Enhancement of magnetoresistance in CAP geometry, in comparison to the normal current in-plane magnetoresistance, was confirmed. The other is the study of magnetic thin wires, which were prepared by depositing in a tilted direction to the surface. A preliminary result of magnetization reversal investigation is presented.
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