Micromagnetic Simulations for Coercivity Improvement Through Nano-Structuring of Rare-Earth-Free L10-FeNi Magnets

In this paper, we investigate the potential of tetragonal L1 0 -ordered FeNi as the candidate phase for rare-earth-free permanent magnets considering anisotropy values from recently synthesized, partially ordered FeNi thin films. In particular, we estimate the maximum energy product (BH)max of L1 0...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2017-11, Vol.53 (11), p.1-5
Main Authors: Kovacs, Alexander, Fischbacher, Johann, Oezelt, Harald, Schrefl, Thomas, Kaidatzis, Andreas, Salikhov, Ruslan, Farle, Michael, Giannopoulos, George, Niarchos, Dimitris
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Coercivity
computer simulation
Demagnetization
Magnetic hysteresis
Magnetism
maximum energy product
mircomagnetics
nanostructured materials
Permanent magnets
Perpendicular magnetic anisotropy
Rare earth elements
rare earth free permanent magnets
Saturation magnetization
Shape
Thin films
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Summary:In this paper, we investigate the potential of tetragonal L1 0 -ordered FeNi as the candidate phase for rare-earth-free permanent magnets considering anisotropy values from recently synthesized, partially ordered FeNi thin films. In particular, we estimate the maximum energy product (BH)max of L1 0 -FeNi nanostructures using micromagnetic simulations. The maximum energy product is limited due to the small coercive field of partially ordered L1 0 -FeNi. Nano-structured magnets consisting of 128 equi-axed, platelet-like, and columnar-shaped grains show a theoretical maximum energy product of 228, 208, and 252 kJ m -3 , respectively.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2017.2701418