SmNi4B: a narrow domain-wall ferromagnet

Mazumdar, Chandan ; Nagarajan, R. ; Gupta, L. C. ; Padalia, B. D. ; Vijayaraghavan, R. (2000) SmNi4B: a narrow domain-wall ferromagnet Applied Physics Letters, 77 (6). pp. 895-897. ISSN 0003-6951

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We have investigated magnetic properties of SmNi4B. The material undergoes a ferromagnetic ordering at TC ≈ 39 K, which, surprisingly, is higher than that of isostructural GdNi4B ( ≈ 36 K). The saturation magnetic moment is rather small (0.15 μB per Sm at 5 K), suggesting the presence of crystal-field effects. Below TC, the material exhibits a large thermomagnetic irreversibility and also a large magnetic hysteresis at 5 K with a coercive field ≈ 28 kOe, which is one of the largest observed in a Sm-based material. We suggest that the large coercive field is intrinsic, associated with narrow domain walls of thickness of only one atomic layer, which resembles a ferroelectric wall.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Samarium Alloys; Nickel Alloys; Boron Alloys; Magnetic Domain Walls; Ferromagnetic Materials; Magnetic Moments; Magnetic Hysteresis; Crystal Field Interactions; Coercive Force
ID Code:11302
Deposited On:09 Nov 2010 03:37
Last Modified:02 Jun 2011 04:55

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