Magnetic-field-induced incommensurate to collinear spin order transition in NiBr2
Magnetic-field-induced incommensurate to collinear spin order transition in NiBr2
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DOI：
10.1063/1.5066625
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发表时间：
2019-03-07
影响因子：
3.2
通讯作者：
Mishra, S. K.
中科院分区：
文献类型：
--
作者：
Babu, S.;Prokes, K.;Mishra, S. K.
NiBr 2的三角形自旋晶格是一个典型的例子，挫折helimagnet显示共线相称的反铁磁到一个不相称的自旋螺旋相变冷却。在此，我们研究了自熔生长的NiBr 2单晶的中子衍射和低温磁化强度测量在磁场高达14 T。实验结果使负责自旋螺旋排序的驱动力的推导。中子衍射数据揭示卫星峰代表的特征的无公度磁状态。卫星在T_N = 44.0（1）K以下对称地发育，取代了主要的磁反射。有趣的是，场诱导的无公度到公度自旋相变已经被成功地证明，这迫使自旋螺旋恢复高温补偿反铁磁结构。这种重新取向可以通过三角形自旋晶格系统的（a-b）基面中的自旋翻转来描述。这一发现为自旋螺旋控制非公度相位提供了一种新的方法，在下一代数据存储设备中具有巨大的科学和技术意义。
The triangular spin lattice of NiBr2 is a canonical example of the frustrated helimagnet that shows a collinear commensurate antiferromagnetic to an incommensurate spin helix phase transition on cooling. Herein, we have studied a self-flux grown NiBr2 single crystal by neutron diffraction and low temperature magnetization measurements at fields up to 14 T. Experimental findings enable the deduction of the driving force responsible for the spin spiral ordering. The neutron diffraction data reveal satellite peaks representing characteristic features of an incommensurate magnetic state. The satellites develop symmetrically below T-N = 44.0(1) K, replacing the main magnetic reflections. Interestingly, a field-induced incommensurate to commensurate spin phase transition has been successfully demonstrated, which enforces the spin helix to restore the high temperature compensated antiferromagnetic structure. This reorientation can be described by a spin-flop in the (a-b) basal plane of a triangular spin lattice system. The findings offer a novel way for spin helix control of incommensurate phases, having immense scientific and technological implications in the next generation data storage devices.