粉体および粉末冶金
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
研究論文
Effect of Strain on Magnetic Properties of Nd-Fe-B Thin Film Magnets on BaTiO3
Ryuji HASHIMOTOTakuya SATOYuji UMEDAYoshitomo TANAKAKenichi SUZUKIYasushi ENOKIDOTomoyasu TANIYAMA
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2018 年 65 巻 5 号 p. 265-268

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The influence of strain in the Nd-Fe-B was investigated by using the structural phase transition of BaTiO3 in films consisting of a Mo top layer (10 nm), Nd-Fe-B (30 nm), and a Mo bottom layer (20 nm) deposited onto BaTiO3 (001) substrates by sputtering. As a result, it was found that the magnetization along the easy axis jumps up in magnitude by 3% at around 280 K. This significant effect is certainly due to the lattice strain accompanying the structural phase transition of BaTiO3 from orthorhombic to tetragonal. First-principles calculations were applied to simulate the relationship between magnetization, magnetocrystalline anisotropy and the strain in the Nd-Fe-B main phase. It was also found that the magnetization along the easy axis increases as the lattice constant of the a-axis expands, which shows mostly good agreement with the experimental results under some assumptions.

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© 2018 by Japan Society of Powder and Powder Metallurgy
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