Simulation of alnico coercivity

Ke, Liqin; Skomski, Ralph; Hoffmann, Todd D.; Zhou, Lin; Tang, Wei; Johnson, Duane D.; Kramer, Matthew J.; Anderson, Iver E.; Wang, C. -Z.

doi:10.1063/1.4992787

Title: Simulation of alnico coercivity

Journal Article · Mon Jul 10 00:00:00 EDT 2017 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4992787· OSTI ID:1371888

Ke, Liqin ^[1]; Skomski, Ralph ^[2]; Hoffmann, Todd D. ^[3]; Zhou, Lin ^[1]; Tang, Wei ^[1];

^[4]; Kramer, Matthew J. ^[1]; Anderson, Iver E. ^[1]; Wang, C. -Z. ^[1]

Ames Lab., Ames, IA (United States)
Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy
1137 W. Emerald Ave., Mesa, AZ (United States)
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Materials Science and Engineering

Micromagnetic simulations of alnico show substantial deviations from Stoner-Wohlfarth behavior due to the unique size and spatial distribution of the rod-like Fe-Co phase formed during spinodal decomposition in an external magnetic field. Furthemore, the maximum coercivity is limited by single-rod effects, especially deviations from ellipsoidal shape, and by interactions between the rods. In both the exchange interaction between connected rods and magnetostatic we consider the interaction between rods, and the results of our calculations show good agreement with recent experiments. Unlike systems dominated by magnetocrystalline anisotropy, coercivity in alnico is highly dependent on size, shape, and geometric distribution of the Fe-Co phase, all factors that can be tuned with appropriate chemistry and thermal-magnetic annealing.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1371888

Alternate ID(s):: OSTI ID: 1369083

Report Number(s):: IS-J-9371

Journal Information:: Applied Physics Letters, Vol. 111, Issue 2; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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