[Fe/Py]/ FeMn/Py多层膜的静磁性能与温度和厚度的关系
Temperature and thickness dependent magnetostatic properties of [Fe/Py]/FeMn/Py multilayers
摘要：
利用SQUID磁强计研究了[Fe/Py]/FeMn/Py多层膜的磁性随温度和反铁磁FeMn间隔层厚度的变化。观察到的行为与6-nm和15-nm的FeMn间隔层的结构有很大不同。虽然15-nm-FeMn结构在从5至300 K的整个测量温度区间中表现出两个铁磁层的交换钉扎，但6-nm-FeMn结构在室温附近变为交换去钉扎。脱钉扎状态的特征在于以零场为中心的单个磁滞回线，并且具有增强的磁性。所观察到的属性解释的有限尺寸效应和可能的铁磁层间耦合通过薄的反铁磁间隔。
英文摘要：
The magnetic properties of thin-film multilayers [Fe/Py]/FeMn/Py are investigated as a function of temperature and thickness of the antiferromagnetic FeMn spacer using SQUID magnetometry. The observed behavior differs substantially for the structures with 6-nm and 15-nm FeMn spacers. While the 15-nm-FeMn structure exhibits exchange pinning of both ferromagnetic layers in the entire measurement temperature interval from 5 to 300 K, the 6-nm-FeMn structure becomes exchange de-pinned in the vicinity of room temperature. The de-pinned state is characterized by a single hysteresis loop centered around zero field and having enhanced magnetic coercivity. The observed properties are explained in terms of finite-size effects and possibly ferromagnetic interlayer coupling through the thin antiferromagnetic spacer.
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