Magnus F, Arnalds U B, Palonen H, Pálsson G K, Ali H, Leifer K, Hjörvarsson B
Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland.
Department of Physics and Astronomy, Uppsala University, Box 516, SE-75121 Uppsala, Sweden.
J Phys Condens Matter. 2021 Aug 25;33(44). doi: 10.1088/1361-648X/ac1c2c.
We investigate the magnetic properties of amorphous SmCo/Co(AlZr)/Co(AlZr)exchange-spring magnet trilayers. The magnetically soft Co(AlZr)layer is coupled to the magnetically hard SmColayer through the weakly magnetic low-Co(AlZr)spacer layer. The strength of the coupling can be controlled with temperature and the coupling persists above the intrinsicof the spacer layer due to a long-range magnetic proximity effect. Polarized neutron reflectivity is used to examine the magnetic profile of the trilayers during magnetization reversal. A two-step switching occurs, with the switching angle of the soft layer strongly dependent on the strength of the coupling. In the strong coupling regime a magnetic state can be achieved where the soft layer magnetization is perpendicular to the hard layer whereas in the weak coupling regime the soft layer reverses fully.
我们研究了非晶态SmCo/Co(AlZr)/Co(AlZr)交换弹簧磁体三层膜的磁性。磁性软的Co(AlZr)层通过弱磁性的低Co(AlZr)间隔层与磁性硬的SmCo层耦合。耦合强度可以通过温度控制，并且由于长程磁近邻效应，耦合在间隔层的本征温度以上仍然存在。极化中子反射率用于研究三层膜在磁化反转过程中的磁结构。发生了两步切换，软层的切换角度强烈依赖于耦合强度。在强耦合 regime 中，可以实现一种磁状态，其中软层磁化垂直于硬层，而在弱耦合 regime 中，软层完全反转。
