Open AccessEffect of applied stress on exchange bias in ferromagnetic/antiferromagnetic bilayers and the phenomenon of the jump
Author(s) -
Bai Yu-Hao,
Guohong Yun,
Narsu Bai
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.4962
Subject(s) - exchange bias , condensed matter physics , ferromagnetism , bistability , antiferromagnetism , magnetization , coercivity , hysteresis , anisotropy , jump , materials science , magnetic anisotropy , stress (linguistics) , field (mathematics) , magnetic field , physics , optics , mathematics , optoelectronics , quantum mechanics , linguistics , philosophy , pure mathematics
Using the principle of minimal energy and S-W modelthe effect of the applied stress on exchange bias in ferromagnetic FM / antiferromagnetic AFM bilayers has been investigated.When the applied field is absentaccording to the relation between the energy of the system and the orientation of ferromagnetic magnetization the system will be in monostable state or bistable statewhich is controlled by the competition between the uniaxial anisotropy and the exchange anisotropy.Monostable state or bistable state of the system determine the angular dependence of exchange bias immediately.When the external field is applied along the intrinsic easy axes and intrinsic hard axes it is found by analyzing the magnetization processes that one of the switching field of the hysteresis loop shows a an abrupt changewhile the other is kept constantand consequently the exchange bias field and the coercivity will appear a jump phenomenon.The numerical calculations indicate that both the exchange bias field and the coercivity are larger in the magnitude at the points of the jump.Both the magnitude and the orientation of the applied stress will significantly affect the exchange bias by making a transition between monostable state and bistable state in the system.This transition induces a significant change in angular dependence of the exchange bias. Our results demonstrate that the applied stress is a viable way to control and tune the exchange bias of the FM/AFM bilayers.