An investigation of phase separation by magnetic force microscopy in La0.45Sr0.55MnO3-$\delta$($\delta$≈0.01)

doi:10.1088/1009-1963/11/3/317

中国物理B ›› 2002, Vol. 11 ›› Issue (3): 288-292.doi: 10.1088/1009-1963/11/3/317

An investigation of phase separation by magnetic force microscopy in La_0.45Sr_0.55MnO_3-$\delta$($\delta$≈0.01)

李润伟, 张臻蓉, 李庆安, 孙继荣, 王志宏, 张绍英, 成昭华, 韩宝善, 沈保根

State Key Laboratory of Magnetism, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China

收稿日期:2001-10-19 修回日期:2001-11-05 出版日期:2002-03-13 发布日期:2005-06-13
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10074081) and State Key Project of Fundamental Research of China (Grant No G1998061310).

An investigation of phase separation by magnetic force microscopy in La_0.45Sr_0.55MnO_{_3-$\delta$($\delta$≈0.01)}

State Key Laboratory of Magnetism, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China

Received:2001-10-19 Revised:2001-11-05 Online:2002-03-13 Published:2005-06-13
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10074081) and State Key Project of Fundamental Research of China (Grant No G1998061310).

摘要/Abstract

摘要： We have found phase separation in La_0.45Sr_0.55MnO_3-δ (LSMO) by means of electron spin resonance, magnetic force microscopy (MFM) and magnetic measurements. Ferromagnetic and antiferromagnetic phases can coexist at low temperatures, and ferromagnetic and paramagnetic phases coexist when the temperature lies between the Néel and Curie temperatures. The size and shape of the ferromagnetic phases (the minority phases) was first observed directly from MFM images. It is suggested that the phase separation in LSMO is not the charge segregation type, but an electroneutral type due perhaps to the nonuniform distribution of oxygen vacancies.

Abstract: We have found phase separation in La_0.45Sr_0.55MnO_3-$\delta$ (LSMO) by means of electron spin resonance, magnetic force microscopy (MFM) and magnetic measurements. Ferromagnetic and antiferromagnetic phases can coexist at low temperatures, and ferromagnetic and paramagnetic phases coexist when the temperature lies between the Néel and Curie temperatures. The size and shape of the ferromagnetic phases (the minority phases) was first observed directly from MFM images. It is suggested that the phase separation in LSMO is not the charge segregation type, but an electroneutral type due perhaps to the nonuniform distribution of oxygen vacancies.

Key words: ferromagnetic cluster, phase separation

中图分类号: (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))

75.30.Kz

68.37.Rt (Magnetic force microscopy (MFM)) 76.30.-v (Electron paramagnetic resonance and relaxation) 75.50.Cc (Other ferromagnetic metals and alloys)

李润伟, 张臻蓉, 李庆安, 孙继荣, 王志宏, 张绍英, 成昭华, 韩宝善, 沈保根. An investigation of phase separation by magnetic force microscopy in La_0.45Sr_0.55MnO_3-$\delta$($\delta$≈0.01)[J]. 中国物理B, 2002, 11(3): 288-292.

Li Run-Wei (李润伟), Zhang Zhen-Rong (张臻蓉), Li Qing-An (李庆安), Sun Ji-Rong (孙继荣), Wang Zhi-Hong (王志宏), Zhang Shao-Ying (张绍英), Cheng Zhao-Hua (成昭华), Han Bao-Shan (韩宝善), Shen Bao-Gen (沈保根). An investigation of phase separation by magnetic force microscopy in La_0.45Sr_0.55MnO_{_3-$\delta$($\delta$≈0.01)}[J]. Chinese Physics, 2002, 11(3): 288-292.

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An investigation of phase separation by magnetic force microscopy in La_0.45Sr_0.55MnO_3-$\delta$($\delta$≈0.01)

An investigation of phase separation by magnetic force microscopy in La_0.45Sr_0.55MnO_{_3-$\delta$($\delta$≈0.01)}

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