CAJ | 학술논문

研究铁磁/反铁磁/铁磁三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"连续倒转行为"以及不可逆"中断倒转行为"三种情形,三种情形的出现强烈地依赖于两界面处的线性耦合和双二次耦合.钉扎界面的交换耦合与旋转界面的交换耦合相互竞争,当钉扎界面耦合占主导时,反铁磁磁矩发生可逆"恢复行为",系统出现交换偏置.在旋转界面耦合占主导情形下,其线性耦合与双二次耦合也相互竞争,分别导致反铁磁磁矩发生不可逆"连续倒转行为"和不可逆"中断倒转行为",系统都不出现交换偏置,但矫顽场都得以增强.相关结论为实验上观测的磁滞能耗以及界面垂直耦合提供了可能的解释.
연구철자/반철자/철자삼층막중계면존재이차이급쌍이차교환우합하반철자자구전동급기교환각향이성.결과표명,기반철자막중적자구전동존재가역"회복행위"、불가역"련속도전행위"이급불가역"중단도전행위"삼충정형,삼충정형적출현강렬지의뢰우량계면처적선성우합화쌍이차우합.정찰계면적교환우합여선전계면적교환우합상호경쟁,당정찰계면우합점주도시,반철자자구발생가역"회복행위",계통출현교환편치.재선전계면우합점주도정형하,기선성우합여쌍이차우합야상호경쟁,분별도치반철자자구발생불가역"련속도전행위"화불가역"중단도전행위",계통도불출현교환편치,단교완장도득이증강.상관결론위실험상관측적자체능모이급계면수직우합제공료가능적해석.
Phases of antiferromagnetic magnetization and exchange bias and coercivity in ferromagnetic/antiferromagnetic/ferromagnetic(FM/AF/FM)trilayers with interface quadratic and biquadratic exchange coupling are studied comprehensively.Three possible cases are found,namely reversible recovering case,irreversible continuously-reversing case and irreversible discontinuouslyreversing case.Realization of the cases strongly depends on pinned-M_(FM) interface quadratic exchange coupling J_1,free-M_(FM) interface quadratic exchange coupling J_2 and biquadratic coupling J'_2.In the reversible recovering,the exchange coupling results in an exchange bias,and there is no exchange bias in other cases.It provides possible explanation for both hysteresis energy loss and perpendicular coupling at the interface.