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Visualization of Melting of Antiferromagnetic Insulator Phase in Phase-Separated Manganite Film using Magnetic Force Microscopy
Hai-biao Zhou,Yu-bin Hou,Qing-you Lu*
Author NameAffiliationE-mail
Hai-biao Zhou Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Tech-nology of China, Hefei 230026, ChinaHigh Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Tech-nology of China, Hefei 230031, China  
Yu-bin Hou High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Tech-nology of China, Hefei 230031, China  
Qing-you Lu* Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Tech-nology of China, Hefei 230026, ChinaHigh Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Tech-nology of China, Hefei 230031, China qxl@ustc.edu.cn 
Abstract:
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.
Key words:  Manganite, Phase-separation, Phase transition, Magnetic force microscope
FundProject:
磁力显微镜对相分离锰氧化物薄膜中反铁磁绝缘相融化的成像
周海彪,侯玉斌,陆轻铀*
摘要:
用自制磁力显微镜研究了一个受各向异性应变的锰氧化物薄膜中的相分离以及由磁场导致的从反铁磁绝缘相到铁磁金属相的转变.磁力显微镜图片显示,在0 T这两种竞争的相就已经共存,且两种相 的畴呈非常明显的各向异性的条状分布,这可以定性解释输运上的各向异性.在2.1 T 以上,反铁磁绝缘相逐渐转变为铁磁金属相,并在3.2 T时结束.当去掉磁场时铁磁金属相能够保持.
关键词:  锰氧化物,相分离,相变,磁力显微镜
DOI:DOI:10.1063/1674-0068/28/cjcp1504064
分类号: