KENBIKYO
Online ISSN : 2434-2386
Print ISSN : 1349-0958
Feature Articles: Towards a thorough Investigation of Material Science by Electron Holography
Magnetic Phase Transition and Microstructure in Manganite
—Direct Observations by Electron Holography and Lorentz Microscopy—
Yasukazu MurakamiHiroto KasaiJoong Jung KimShuichi MamishinDaisuke ShindoShigeo MoriAkira Tonomura
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2010 Volume 45 Issue 3 Pages 161-165

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Abstract

The nucleation and growth mechanism of the ferromagnetic phase inside the charge ordered insulator state of La0.25Pr0.375Ca0.375MnO3, which is a typical manganite showing colossal magnetoresistance, was studied by electron holography and Lorentz microscopy.  Cryogenic Lorentz microscopy observations revealed a zig-zag interface that separated the ferromagnetic phase from the non-magnetic mother phase.  The results indicated a significant pinning effect for the motion of phase boundary, and the pinning forces originated from the structural antipathy between the ferromagnetic phase and the charge-ordered state.  We also determined magnetic parameters, such as the magnetocrystalline anisotropy constant, by using the electron microscopy observations.

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© 2010 The Japanese Society of Microscopy
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