Antiferromagnetic domains and the spin-flop transition of MnF2
Antiferromagnetic domains and the spin-flop transition of MnF2
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MnF2 的反铁磁畴和自旋翻转跃迁
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
R. Kleb
中科院分区：
文献类型：
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作者：
G. Felcher;R. Kleb
在反铁磁MnF2中，锰的磁矩沿金红石结构的四方轴排列。在沿该轴的磁场HSF中（在4.2 K时为9.27 T），反铁磁矩在基面上翻转。偏振中子衍射测量表明，在大约HSF时，整个晶体在一个反铁磁畴内排列，即使在磁场被抑制后仍然存在。这种效应是由于施加的场与晶体的四边形轴的微小偏差（几分之一度）造成的。自旋-倒跃迁中对称性的破坏提供了一种控制这类反铁磁体畴的方法。
In antiferromagnetic MnF2 the magnetic moments of manganese are aligned along the tetragonal axis of the rutile structure. In a magnetic field HSF along that axis (9.27 T at 4.2 K) the antiferromagnetic moments flop in the basal plane. Polarized neutron diffraction measurements showed that at about HSF the entire crystal becomes aligned in a single antiferromagnetic domain, which persists even after the field is suppressed. The effect is due to a minute misalignment (a fraction of degree) of the applied field with the tetragonal axis of the crystal. The ensuing breakdown of symmetry at the spin-flop transition provides a way to control domains in this type of antiferromagnet.