Observation of spin textures in La1-xSrxMnO3 (x=0.175)
Observation of spin textures in La1-xSrxMnO3 (x=0.175)
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La1-xSrxMnO3 (x=0.175) 中自旋织构的观察
DOI：
10.1063/1.4943611
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发表时间：
2016
期刊：
影响因子：
1.6
通讯作者：
K. Harada and S. Mori
中科院分区：
文献类型：
--
作者：
A.Kotani;H. Nakajima;Y. Ishii;K. Harada and S. Mori
利用小角电子衍射（SmAED）和低温洛仑兹透射电子显微镜（TEM）研究了具有中心对称晶体结构的La{sub 0.825}Sr{sub 0.175}MnO{sub 3}铁磁金属相的自旋拓扑织构。原位Lorentz TEM和SmAED实验表明，I型和II型磁泡是在垂直磁场的作用下由具有布洛赫型畴壁的磁条畴演化而来的。具有左手和右手自旋螺旋度的I型磁泡随机分布，同时局部形成II型磁泡。关于I型和II型磁泡，重要的一点是它们的出现强烈地依赖于是否沿[001]方向施加平行于磁易轴沿着的垂直磁场。我们的实验结果表明，磁泡的稳定性应该源于长程偶极-偶极相互作用，而不是在螺旋磁体中的Dzyaloshinskiii-Moriya相互作用。
We have investigated topological spin textures in the ferromagnetic metallic phase of La{sub 0.825}Sr{sub 0.175}MnO{sub 3} with the centrosymmetric crystal structure by small-angle electron diffraction (SmAED) and low-temperature Lorentz transmission electron microscopy (TEM) experiments. In-situ Lorentz TEM and SmAED experiments revealed that type-I and type-II magnetic bubbles evolved from magnetic stripe domains with the Bloch-type domain wall by applying vertical magnetic field. Type-I magnetic bubbles with left-handed and right-handed spin helicity were randomly distributed and simultaneously type-II magnetic bubbles are formed locally. The important point about type-I and type-II magnetic bubbles is that their emergence depends strongly on whether perpendicular magnetic field is applied parallel to the magnetic easy axis along the [001] direction. Our experimental results suggested that the stabilization of magnetic bubbles should originate from the long-range dipole-dipole interactions, as opposed to the Dzyaloshinskii-Moriya interaction in helical magnets.