Magnetism

Generation of nonequilibrium magnetic nuclei in a rapidly growing magnetic field in Pt/Co/Ir/Co/Pt synthetic ferrimagnets

R. B. Morgunov, A. I. Bezverkhnii

Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region

Abstract: In a Pt/Co/Ir/Co/Pt synthetic ferrimagnet with perpendicular magnetic anisotropy, stochastically occurring peak of magnetic moment was detected in the rapidly increasing magnetic field of 16 kOe/s sweep rate at $T$ = 300 K. The peak arises at the coinciding switching fields between three equilibrium magnetization states. The reason of the peak is nucleation of the nonequilibrium magnetic domains in the vicinity of structural defects of the Co film, where diminished activation energy of magnetic nucleation takes place.

Keywords: synthetic ferrimagnet, perpendicular magnetic anisotropy, nonequilibrium magnetization states, exchange interaction, dynamical system.

Received: 19.06.2020
Revised: 19.06.2020
Accepted: 09.07.2020

DOI: 10.21883/FTT.2020.11.50110.131

 English version: Physics of the Solid State, 2020, 64:11, 2070–2076

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