硬磁/反铁磁交换耦合对反铁磁FeMn稳定性影响研究  

The hard magnet/antiferromagnet exchange coupling effect on the stability of antiferromagnetic FeMn

作　　者：蒋庆林[1,2] 张小伟[1,2] 倪经[3] 代波[1,2] 

机构地区：[1]西南科技大学四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地,四川绵阳621010 [2]西南科技大学材料科学与工程学院,四川绵阳621010 [3]西南应用磁学研究所,四川绵阳621000

出　　处：《功能材料》2012年第11期1369-1372,1377,共5页Journal of Functional Materials

基　　金：国家自然科学基金青年科学基金资助项目(10704061);面上基金资助项目(11074206)

摘　　要：采用磁控溅射方法在SiO2基体上制备了FePt/FeMn/NiFe/Ta多层膜样品,通过FeMn/NiFe双层膜交换偏置的变化研究了硬磁FePt不同磁化状态对反铁磁层FeMn的影响。实验表明,磁化了的L10相FePt能使FeMn在较薄的情况下(4.5nm)对NiFe产生比较强的交换偏置;而未被磁化的FePt对FeMn/NiFe交换偏置影响并不明显。认为更薄的反铁磁层对另外的铁磁层产生交换偏置是由于硬磁与反铁磁的界面交换耦合作用能增强反铁磁的稳定性。The FePt/FeMn/NiFe/Ta multilayers were deposited on the SiO2 substrate by using magnetron sputtering system.The effect of hard magnet FePt on the thermal stability of antiferromagnet FeMn had been studied through the variations of exchange coupling between the FeMn and NiFe bilayers.It was found that the L10 phase of FePt makes thin FeMn pin NiFe well and there is no clear effect on the FeMn/NiFe exchange bias when FePt not magnetized.We attributed this to that the exchange coupling between hard magnet and the antiferromagnet can enhance the anisotropy energy of the antiferromagnet.

关 键 词：交换偏置 FEPT 稳定性 

分 类 号：TB34[一般工业技术—材料科学与工程] O469[理学—凝聚态物理]