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Imaging of ferromagnetic domains using photoelectrons: Photoelectron emission microscopy of neodymium‐iron‐boron (Nd2Fe14B)

 

作者: M. Mundschau,   J. Romanowicz,   J. Y. Wang,   D. L. Sun,   H. C. Chen,  

 

期刊: Journal of Vacuum Science&Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena  (AIP Available online 1996)
卷期: Volume 14, issue 4  

页码: 3126-3130

 

ISSN:1071-1023

 

年代: 1996

 

DOI:10.1116/1.589074

 

出版商: American Vacuum Society

 

关键词: FERROMAGNETIC MATERIALS;NEODYMIUM BORIDES;IRON BORIDES;DOMAIN STRUCTURE;PHOTOEMISSION;MICROSCOPY;CURIE POINT;TEMPERATURE DEPENDENCE;Nd2Fe14B

 

数据来源: AIP

 

摘要:

Ferromagnetic domains of a single crystal of neodymium‐iron‐boron, Nd2Fe14B (one of the strongest permanent magnetic materials known) are imaged by focusing a beam of photoelectrons with electrostatic optics in a photoelectron emission microscope. Photoelectrons emitted from the surface are deflected laterally into two opposite directions by stray magnetic fields that exist above the domains. The photoelectron beam is partially split into two. Magnetic contrast is produced by blocking part of the beam and imaging with an edge of the beam. The magnetic contrast mechanism appears to be similar to the type I magnetic contrast mechanism known from scanning electron microscopy, in which stray magnetic fields above the ferromagnetic domains deflect secondary electrons either towards or away from the electron detector. Upon heating the sample above the Curie temperature, the ferromagnetic domains gradually disappear, as expected for a second order phase transition. They reappear upon cooling.

 

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