Visualization of Melting of Antiferromagnetic Insulator Phase in Phase-Separated Manganite Film using Magnetic Force Microscopy

Visualization of Melting of Antiferromagnetic Insulator Phase in Phase-Separated Manganite Film using Magnetic Force Microscopy
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使用磁力显微镜可视化相分离锰氧化物薄膜中反铁磁绝缘体相的熔化

DOI:
10.1063/1674-0068/28/cjcp1504064
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发表时间:
2015-12
影响因子:
1
通讯作者:
Lu, Qing-you
Lu, Qing-you
中科院分区:
化学4区
文献类型:
--
作者:
Zhou, Hai-biao;Hou, Yu-bin;Lu, Qing-you

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利用自制的磁力显微镜(MFM)对各向异性应变锰氧化物薄膜中的反铁磁电荷有序绝缘体(AFI)相到铁磁金属(FM)相的相分离和磁场诱导相变进行了直接成像。在10 K下的MFM图像表明,这两个竞争相已经在零磁场下共存。观察到条纹状相畴的显著各向异性分布,这可以定性地解释各向异性输运。在2.2T以上,AFI相位开始逐渐向FM相位转变。AFI相在3.2T时完全熔化。FM相可以保留后,磁场被删除,表明在此温度下的AFI相的亚稳性质。
The phase separation and magnetic-field-induced transition of the antiferromagnetic charge-ordered insulator (AFI) phase into the ferromagnetic metal (FM) phase in an anisotropically-strained manganite thin film is directly imaged using a home-built magnetic force microscope (MFM). The MFM images at 10 K show that the two competing phases already coexist in zero magnetic field. Remarkably anisotropic distribution of the stripe-like phase domains are observed, which can qualitatively account for the anisotropic transport. Above 2.2 T, the AFI phase starts to transform into FM phase gradually. The melting of AFI phase is completed at 3.2 T. The FM phase can be retained after the magnetic field is removed, suggesting the metastable nature of the AFI phase at this temperature.
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