An in-situ study of magnetic domain structures in undercooled Fe-29.5 at. %Pd magnetostrictive alloys by Lorentz microscopy and electron holography

2015 ◽  
Vol 117 (16) ◽  
pp. 163909 ◽  
Author(s):  
Wen Sun ◽  
Xianhui Xu ◽  
Jian Liu ◽  
Weixing Xia ◽  
Aru Yan
Keyword(s):  
Magnetic Domain ◽  
Electron Holography ◽  
Lorentz Microscopy ◽  
In Situ Study ◽  
Domain Structures

scholarly journals Magnetic Domain Structures in Electrical Steel Sheets Studied by Lorentz Microscopy and Electron Holography

2005 ◽  
Vol 46 (5) ◽  
pp. 974-977 ◽  
Author(s):  
Zentaro Akase ◽  
Young-Gil Park ◽  
Daisuke Shindo ◽  
Toshiro Tomida ◽  
Hiroyosi Yashiki ◽  
...  
Keyword(s):  
Electrical Steel ◽  
Magnetic Domain ◽  
Electron Holography ◽  
Lorentz Microscopy ◽  
Steel Sheets ◽  
Domain Structures ◽  
Electrical Steel Sheets

Single and Multi–Magnetic Domain Structures Studied by Electron Holography and Lorentz Microscopy

2004 ◽  
Vol 10 (S02) ◽  
pp. 500-501
Author(s):  
Tsukasa Hirayama ◽  
Kazuo Yamamoto ◽  
Takayoshi Tanji
Keyword(s):  
Magnetic Domain ◽  
Electron Holography ◽  
Lorentz Microscopy ◽  
Domain Structures

Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.

Temperature Dependence of Magnetic Domains and Wall Structures

1972 ◽  
Vol 30 ◽  
pp. 496-497
Author(s):  
Sonoko Tsukahara ◽  
Tadami Taoka ◽  
Hisao Nishizawa
Keyword(s):  
Temperature Dependence ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Iron Film ◽  
Objective Lens ◽  
Lorentz Microscopy ◽  
Domain Structures ◽  
Wall Structures ◽  
Crystal Films ◽  
Metallurgical Structure

The high voltage Lorentz microscopy was successfully used to observe changes with temperature; of domain structures and metallurgical structures in an iron film set on the hot stage combined with a goniometer. The microscope used was the JEM-1000 EM which was operated with the objective lens current cut off to eliminate the magnetic field in the specimen position. Single crystal films with an (001) plane were prepared by the epitaxial growth of evaporated iron on a cleaved (001) plane of a rocksalt substrate. They had a uniform thickness from 1000 to 7000 Å.The figure shows the temperature dependence of magnetic domain structure with its corresponding deflection pattern and metallurgical structure observed in a 4500 Å iron film. In general, with increase of temperature, the straight domain walls decrease in their width (at 400°C), curve in an iregular shape (600°C) and then vanish (790°C). The ripple structures with cross-tie walls are observed below the Curie temperature.

Observations of Magnetic Domain Structure Change in Nd2Fe14B Magnets at Elevated Temperature with External Magnetic Field by Lorentz Microscopy

2015 ◽  
Vol 1754 ◽  
pp. 31-36 ◽  
Author(s):  
Toshimasa Suzuki ◽  
Koichi Kawahara ◽  
Haruka Tanaka ◽  
Kimihiro Ozaki
Keyword(s):  
Elevated Temperature ◽  
Domain Wall ◽  
Wall Motion ◽  
Magnetic Domain ◽  
Domain Wall Motion ◽  
Magnetic Domain Wall ◽  
Lorentz Microscopy ◽  
Pinning Effect ◽  
In Situ Observations

ABSTRACTIn this study, we conducted the in-situ observations of the magnetic domain structure change in Nd2Fe14B magnets at elevated temperature by transmission electron microscopy (TEM) / Lorentz microscopy. The in-situ observations in Nd2Fe14B magnets revealed that the magnetization reversal easily occurred at the elevated temperature. At more than 180°C, the magnetic domain wall motion could be observed by applying the magnetic field of less than 20 mT. The motion of the magnetic domain wall was discontinuous and the domain wall jumped to one grain boundary to the neighboring grain boundary at 180°C. On the other hand, the continuous domain wall motion within grain interior as well as discontinuous domain wall motion was observed at 225°C, and some grain boundaries showed still strong pinning effect even at 225°C. The temperature dependence of the pinning effect of grain boundaries would not uniform.

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