This article is cited in 2 papers

XXII International Symposium ''Nanophysics and Nanoelectronics'', Nizhny Novgorod, March 12-15, 2018
Magnetism

Domain structure and magnetization reversal micromechanisms in quasi-two-dimensional exchange-biased nanomagnetics

V. S. Gornakov^a, I. V. Shashkov^a, M. A. Lebyodkin^b, T. A. Lebyodkina<sup>b

a</sup> Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region
^b Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux, Université de Lorraine, CNRS, Arts et Métiers ParisTech, Metz, France

Abstract: The domain structure and magnetization reversal mechanisms are studied in quasi-two-dimensional exchange-biased NiFe/FeMn and NiFe/NiO nanomagnetics, using a complex method of magnetooptical indicator films and acoustic emission. The presence of the axial dispersion of unidirectional anisotropy in grains of the antiferromagnetic layer is shown to determine the statistic distribution and chirality of spin springs near the interface. The acoustic emission signals caused by the excitation of elastic Lamb waves upon the magnetization reversal of NiFe/NiO heterostructure are found. The coercive force of these systems is due to irreversible processes to overcome potential barriers that are induced by the formation of spin springs with different chirality, localized in the antiferromagnetic near the ferromagnetic–antiferromagnetic boundary.

Keywords: Magnetization Reversal, Spin Spring, Lamb Waves, Magneto-optical Indicator Film, Unidirectional Anisotropy.

DOI: 10.21883/FTT.2018.11.46661.19NN

 English version: Physics of the Solid State, 2018, 60:11, 2222–2230

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