Spontaneous exchange bias in high energy ball milled MnBi alloys

被引：15

作者：

Anuraag, N. S. ^{[1
]}

Shaw, S. K. ^{[1
]}

Meena, Sher Singh ^{[2
]}

Singh, R. K. ^{[3
]}

Prasad, N. K. ^{[1
]}

机构：

[1] Banaras Hindu Univ, Indian Inst Technol, Dept Met Engn, Varanasi 221005, Uttar Pradesh, India

[2] Bhabha Atom Res Ctr, Solid State Phys Div, Mumbai 400085, Maharashtra, India

[3] Def Met Res Lab, Adv Magnet Lab, Hyderabad 500058, India

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2022年 / 557卷

关键词：

Rare-earth-free permanent magnets; Spontaneous exchange bias; Ball milling; MnBi hard magnet; LOW-TEMPERATURE PHASE; MAGNETIC-PROPERTIES; ELECTRONIC-STRUCTURE; THIN-FILMS; COERCIVITY;

D O I：

10.1016/j.jmmm.2022.169478

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Low temperature phase (LTP) MnBi has received considerable interest as a prospective "Gap Magnet" between the ferrites and rare-earth magnets. The ball-milled Mn55+xBi45-x (x = 0, 1, 3, 5, 8) powders exhibited a positive spontaneous exchange bias (SEB) at room temperature, which is yet to be reported for this system. The vacuum arc melted alloys were homogenized and then subjected to high-energy ball milling. The pinning of ferromagnetic MnBi spins by localized antiferromagnetic clusters (due to Mn interstitials, anti-site disorder, and compositional fluctuations) is proposed to be the cause for SEB phenomenon. A noticeable coercivity of around 7.5 kOe at ambient temperature was achieved for x = 8 sample after 8 h of milling. The maximum exchange bias field (H-EB) of around 1.2 kOe at room temperature has been observed for x = 2 after 4 h and x = 8 after 8 h of milling. Apart from hard magnets, this phenomenon opens up the possibility of its application in magnetoresistive random access memory (MRRAM) devices and spintronics.

引用

页数：8

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