Lorentz TEM study of the magnetic microstructure in near-eutectoid Co-Pt alloys

Lorentz TEM study of the magnetic microstructure in near-eutectoid Co-Pt alloys
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近共析 Co-Pt 合金磁性微观结构的洛伦兹 TEM 研究

DOI:
10.1016/j.jmmm.2019.02.036
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发表时间:
2019
影响因子:
2.7
通讯作者:
De Graef, Marc
De Graef, Marc
中科院分区:
材料科学3区
文献类型:
--
作者:
Kashyap, Isha;Vetter, Eric P.;Floro, Jerrold A.;De Graef, Marc

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在本文中,我们报告了近共析 Co 40 Pt 60 合金中磁畴结构的洛伦兹透射电子显微镜 (LTEM) 观察结果。使用传统的明场/暗场 TEM 成像来表征晶体微观结构。通过使用强度传输方程重建电子波的相位,从菲涅耳离焦图像中提取磁域内的磁感应方向。该合金呈现出由L1 0 四方相和L1 2 立方相组成的纳米棋盘图案。发现纳米棋盘结构中四个相邻L1 0 瓦片中的磁化分布遵循涡旋/反涡旋配置,以降低静磁和磁晶各向异性能量。在L1 0 相和L1 2 相的相间边界处观察到被称为相间磁畴壁(IPMDW)的非常规畴壁。还记录了其他微观结构(花呢微观结构、宏观孪晶结构、粗化 L1 0 板)中的磁畴壁。
In this paper, we report Lorentz Transmission Electron Microscopy (LTEM) observations of magnetic domain structures in a near-eutectoid Co 40 Pt 60 alloy. The crystallographic microstructure is characterized using conventional bright field/dark field TEM imaging. The magnetic induction orientation inside magnetic domains is extracted from Fresnel through-focus images by reconstructing the phase of electron wave using the transport-of-intensity equation. The alloy shows a nano-chessboard pattern composed of the L1 0 tetragonal and L1 2 cubic phases. The magnetization distribution in four neighboring L1 0 tiles in the nano-chessboard structure is found to follow a vortex/anti-vortex configuration to reduce the magnetostatic and magneto-crystalline anisotropy energies. An unconventional domain wall referred to as an inter phase magnetic domain wall (IPMDW) is observed at the inter-phase boundaries of L1 0 and L1 2 phases. Magnetic domain walls in other microstructures (tweed microstructure, macro-twinned structure, coarsened L1 0 plates) are also documented.
使用洛伦兹 TEM 对 Ni-Mn-Ga Heusler 合金进行磁域成像
DOI: 10.1017/s1431927616009442
发表时间: 2016
影响因子: 2.8
作者:
Isha Kashyap;M. De Graef
通讯作者: M. De Graef
DOI: 10.1016/s1359-6454(97)00455-2
发表时间: 1998-05-01
期刊: ACTA MATERIALIA
影响因子: 9.4
作者:
Le Bouar, Y;Loiseau, A;Khachaturyan, AG
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DOI: --
发表时间: 2004
期刊: J.Appl.Phys. 96
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DOI: 10.1016/j.jmmm.2014.09.054
发表时间: 2015
影响因子: 2.7
作者:
Priya Ghatwai;E. Vetter;M. Hrdy;W. Soffa;J. Floro
通讯作者: J. Floro