Domain wall generation and propagation in an amorphous ferromagnetic NiFeSiB film confirmed by the magneto-optical indicator film method

ABSTRACTWe have applied a polarized light optical microscope in reflective mode with a Bi-substituted yttrium-iron-garnet indicator film with in-plane anisotropy for visualization of the magnetostatic fields produced by nanostructured magnetic CoNiCu/Cu electrodeposited multilayers. By analysis of the magneto-optical stray field image, detailed information is obtained not only on the as-grown multilayer magnetic structure but on its change during the magnetization reversal processes. The influences of crystal lattice defects and nonuniformity of the nonmagnetic spacers thicknesses on the domain wall nucleation and motion are studied. Peculiarities of the re-magnetization of antiferromagnetically exchange coupled multilayers are discussed, including real-time observations of domain wall creep in a constant applied field.

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Experimental study of the microscopic mechanisms of magnetization reversal inFeNi∕FeMnexchange-biased ferromagnet/antiferromagnet polycrystalline bilayers using the magneto-optical indicator film technique

Physical Review B ◽

10.1103/physrevb.73.184428 ◽

2006 ◽

Vol 73 (18) ◽

Cited By ~ 20

Author(s):

V. S. Gornakov ◽

Yu. P. Kabanov ◽

O. A. Tikhomirov ◽

V. I. Nikitenko ◽

S. V. Urazhdin ◽

...

Keyword(s):

Experimental Study ◽

Magnetization Reversal ◽

Optical Indicator ◽

Indicator Film

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Statistical and Multifractal Properties of Barkhausen Jumps in Exchange-Coupled Antiferromagnetic/Ferromagnetic Bilayers

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.215.35 ◽

2014 ◽

Vol 215 ◽

pp. 35-40 ◽

Cited By ~ 2

Author(s):

Ivan V. Shashkov ◽

Mikhail A. Lebyodkin ◽

Vladimir S. Gornakov

Keyword(s):

Statistical Analysis ◽

Hysteresis Loop ◽

Multifractal Analysis ◽

Material Structure ◽

Statistical Distributions ◽

Magnetization Process ◽

Pinning Centers ◽

Jump Size ◽

Optical Indicator ◽

Indicator Film

Statistical and multifractal properties of Barkhausen jumps in exchange-coupled ferromagnet/antiferromagnet bilayers are studied on Co/IrMn and NiFe/NiO heterostructures using a magneto-optical indicator film technique. The statistical analysis proves a nonstochastic character of magnetization jumps. In particular, power-law behavior is observed for Co/IrMn samples. Furthermore, the statistics depends on the ferromagnet layer thickness and antiferromagnet layer material structure. The average jump size displays an asymmetry between the forward and backward branches of the hysteresis loop, particularly pronounced for the structure with a thin Co layer. In spite of the observation of such an asymmetry in the activity of the domain nucleation and pinning centers, the statistical distributions of jumps do not show any significant differences for two branches of the hysteresis loop. The conclusion on a nonrandom character of the magnetization process is supported by the multifractal analysis which reveals the presence of correlations in the time arrangement of the Barkhausen jumps.

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