Dipolar energies in Nd-Fe-B nanocrystalline magnets with and without Nd-Cu infiltration

We analyze the dipolar energies of Nd-Cu-infiltrated Nd-Fe-B nanocrystalline magnets during magnetization reversals by visualizing the magnetic dipolar interactions. Non-magnetic phases from the grains were identified by analyzing the element-specific magnetization distribution images taken with sca...

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Bibliographic Details
Published inJournal of applied physics Vol. 117; no. 17
Main Authors Ohtori, Hiroyuki, Iwano, Kaoru, Mitsumata, Chiharu, Yano, Masao, Kato, Akira, Shoji, Tetsuya, Manabe, Akira, Ono, Kanta
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 07.05.2015
Subjects
Coercivity
Energy transmission
Ferrous alloys
Image transmission
Infiltration
Magnetic materials
Magnetization
Magnets
Microscopy
Nanocrystals
Neodymium
X ray microscopy
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Summary:We analyze the dipolar energies of Nd-Cu-infiltrated Nd-Fe-B nanocrystalline magnets during magnetization reversals by visualizing the magnetic dipolar interactions. Non-magnetic phases from the grains were identified by analyzing the element-specific magnetization distribution images taken with scanning transmission X-ray microscopy. The magnetic dipolar interactions were calculated from the interactions between the magnetization at each point and those at other points in the scanning transmission X-ray microscopy images. We present the dipolar energy distributions in Nd-Cu infiltrated nanocrystalline Nd-Fe-B magnets and compare them with those in nanocrystalline Nd-Fe-B magnets without Nd-Cu infiltration. The interplay between the exchange and dipolar interactions in Nd-Fe-B magnets is found to be essential for obtaining high coercivities.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4914964