Stochastic spontaneous magnetization switching of a synthetic antiferromagnet GdFeCo/Ir/Gd Fe Co with perpendicular anisotropy
Bakhmetiev M. V.1, Dmitriev O. S.2, Valeev R. A.3, Piskorsri V. P.3, Burkanov M. V.3, Morgunov R. B.1,2,3
1Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS, Сhernogolovka, Russia
2Tambov State Technical University, Tambov, Russia
3All-Russian Scientific Research Institute of Aviation Materials of the Research Center "Kurchatov Institute", Moscow, Russia
Email: spintronics2022@yandex.ru
Statistical patterns of spontaneous magnetization reversal of a synthetic GdFeCo/Ir/GdFeCo ferrimagnet with perpendicular anisotropy in the ranges of magnetic fields close to, but not equal to, the critical switching fields of four stable magnetization states P+, AP+, AP- and P- corresponding to two parallel (P+, P-) and two antiparallel (AP+, AP-) the mutual directions of magnetization of the thick and thin layers of GdFeCo. Instead of a sharp switch between the AP+ and AP- states in the critical field, in our experiments there is a spontaneous switching of magnetization delayed by a time interval that varies stochastically from experience to experience. Statistical analysis of a series of time dependences of magnetization revealed a decrease in the average delay duration as it approaches the critical field. Keywords: dynamics of magnetization reversal, synthetic ferromagnets, magnetic relaxation.
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