Ca3Ru2O7单晶的自旋阀效应和磁电阻率
Spin-valve effect and magnetoresistivity in single crystalline Ca3Ru2O7
摘要：
层状钙钛矿Ca3Ru2O7自然地形成交替磁矩方向的铁磁双层，如在自旋阀超晶格中。由于对材料中的各种磁相和相变缺乏清晰的认识，材料中巨大磁阻效应的机理一直存在争议。在磁场中的中子衍射研究中，我们确定了四种不同的磁相在Ca3Ru2O7和确定它们之间的所有一阶和二阶相变。自旋阀机制，然后很容易解释占主导地位的磁阻效应在Ca3Ru2O7。
英文摘要：
The laminar perovskite Ca3Ru2O7 naturally forms ferromagnetic double-layers of alternating moment directions, as in the spin-valve superlattices. The mechanism of huge magnetoresistive effect in the material has been controversial due to a lack of clear understanding of various magnetic phases and phase-transitions. In this neutron diffraction study in a magnetic field, we identify four different magnetic phases in Ca3Ru2O7 and determine all first-order and second-order phase transitions between them. The spin-valve mechanism then readily explains the dominant magnetoresistive effect in Ca3Ru2O7.
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