CAJ | 학술논문

采用磁控溅射法制备居里温度(T_C)略低于奈尔温度(T_N)的Cr/Gd双层薄膜. 利用振动样品磁强计研究薄膜在不同温度下的磁滞特性. 结果表明: 该类薄膜系统与T_C＞T_N的铁磁/反铁磁双层薄膜的磁滞特性不同,当测量温度(T)大于TC时,Gd层处于铁磁态,矫顽力(H_C)随温度非单调变化;当T为80～205 K时,H_C随温度增加逐渐减小;在T=205 K出现一个极小值后逐渐增大;在T=255 K附近出现一个主峰;当T为255～295 K时,H_C随温度升高迅速减小;当T＞295 K时,H_C随温度升高迅速增大. 即铁磁/反铁磁界面处的反铁磁自旋与铁磁自旋的交换耦合作用对铁磁层磁有序态的维持温度和矫顽力影响较大.
채용자공천사법제비거리온도(T_C)략저우내이온도(T_N)적Cr/Gd쌍층박막. 이용진동양품자강계연구박막재불동온도하적자체특성. 결과표명: 해류박막계통여T_C＞T_N적철자/반철자쌍층박막적자체특성불동,당측량온도(T)대우TC시,Gd층처우철자태,교완력(H_C)수온도비단조변화;당T위80～205 K시,H_C수온도증가축점감소;재T=205 K출현일개겁소치후축점증대;재T=255 K부근출현일개주봉;당T위255～295 K시,H_C수온도승고신속감소;당T＞295 K시,H_C수온도승고신속증대. 즉철자/반철자계면처적반철자자선여철자자선적교환우합작용대철자층자유서태적유지온도화교완력영향교대.
The Cr/Gd bilayer was deposited by magnetron sputtering method,where the Curie temperature T_C of the ferromagnetic Gd layer was less than the Néel temperature T_N of the antiferromagnetic Cr layer. The temperature dependence of the magnetic properties of the film was characterized by means of vibrating-sample magnetometer (VSM). It was shown that the Cr/Gd bilayer exhibited quite different behaviors from those of the FM/AFM bilayers with T_C＞T_N. We have observed that the Gd layer persisted in the ferromagnetic phase even at T＞T_C. The coercivity H_C of the film does not vary monotonously with temperature. H_C decreases with temperature increase in a temperature range of 80～205 K,exhibiting a minimum value at T=205 K,and then goes up until reaching a peak at T=255 K,at 255 K＜T＜295 K,the coercivity decreases sharply with temperature,when T＞295 K,however,H_C increases with temperature increase. The experimental results indicate that the magnetic ordered temperature and coercivity of the ferromagnetic layer are strongly influenced by the interfacial exchange coupling between the Gd and Cr layers.