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研究了交换偏置双层膜中界面存在二次以及双二次交换耦合下反铁磁磁矩转动及其交换各向异性.结果表明,其反铁磁膜中的磁矩转动存在可逆“恢复行为”、不可逆“半转动行为”、不可逆“倒转行为”以及不可逆“半倒转行为”四种情形,四种情形的出现强烈地依赖于界面二次、双二次耦合以及反铁磁膜厚度.其中可逆恢复行为情况下,系统出现交换偏置,而不可逆的半转、半倒转以及倒转情形,系统不出现交换偏置.特别地,在界面处仅存在双二次耦合的情形下,其界面双二次耦合常数J2≤0.1σw(反铁磁畴壁能量σw)时,系统有正交换偏置,若J2>0.1σw,系统出现增强的矫顽场,但无交换偏置.当界面处存在二次耦合下,其双二次耦合可削弱甚至消除交换偏置,而总增强矫顽场.
The antiferromagnetic moment rotation and its exchange anisotropy under the double exchange and double quadratic exchange coupling in the interface of exchange bias bilayer were investigated. The results show that there is reversible magnetic moment rotation in the antiferromagnetic film, Recovery behavior “, irreversible ” semi-rotating behavior “, irreversible ” reversal behavior “and irreversible ” semi-reversal behavior ". The occurrence of the four cases strongly depends on the interface quadratic, Coupling and anti-ferromagnetic film thickness.Among them, under the condition of reversible recovery, the system has exchanging bias, but irreversible semi-translating, semi-inverting and reversing situation, the system does not exchange excursion.In particular, there are only bis In the case of secondary coupling, the system has an orthogonally biased system when the double quadratic coupling constant J2≤0.1σw (antiferromagnetic domain wall energy σw). If J2> 0.1σw, the system has an enhanced coercive field, No exchange bias.When there is a secondary coupling at the interface, the biquadratic coupling can weaken or even eliminate the exchange bias, but enhance the coercive field.