Artificially produced rare-earth free cosmic magnet

被引：68

作者：

Makino, Akihiro ^{[1
]}

Sharma, Parmanand ^{[2
]}

Sato, Kazuhisa ^{[2
]}

Takeuchi, Akira ^{[2
]}

Zhang, Yan ^{[2
]}

Takenaka, Kana ^{[2
]}

机构：

[1] Tohoku Univ, Sendai, Miyagi 9808577, Japan

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

基金：

日本学术振兴会;

关键词：

HIGH B-S; STONY-IRON; ALLOYS; FENI;

D O I：

10.1038/srep16627

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Chemically ordered hard magnetic L1(0)-FeNi phase of higher grade than cosmic meteorites is produced artificially. Present alloy design shortens the formation time from hundreds of millions of years for natural meteorites to less than 300 hours. Electron diffraction detects four-fold 110 superlattice reflections and a high chemical order parameter (S >= 0.8) for the developed L1(0)-FeNi phase. The magnetic field of more than 3.5 kOe is required for the switching of magnetization. Experimental results along with computer simulation suggest that the ordered phase is formed due to three factors related to the amorphous state: high diffusion rates of the constituent elements at lower temperatures when crystallizing, a large driving force for precipitation of the L1(0) phase, and the possible presence of L1(0) clusters. Present results can resolve mineral exhaustion issues in the development of next-generation hard magnetic materials because the alloys are free from rare-earth elements, and the technique is well suited for mass production.

引用

页数：8

共 25 条

[1]

ALBERTSEN JF, 1980, PHYS SCRIPTA, V22, P171, DOI 10.1088/0031-8949/22/2/014

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