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Stress induced anisotropy in Co-rich magnetic nanocomposites for inductive applications

Published online by Cambridge University Press:  04 October 2016

A. Leary ,
V. Keylin ,
A. Devaraj ,
V. DeGeorge ,
P. Ohodnicki  and
M.E. McHenry
A. Leary*
Affiliation:
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15221
V. Keylin
Affiliation:
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15221
A. Devaraj
Affiliation:
Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354
V. DeGeorge
Affiliation:
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15221
P. Ohodnicki
Affiliation:
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15221, and National Energy Technology Laboratory (NETL), Pittsburgh, PA 15236
M.E. McHenry
Affiliation:
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15221
*
a) Address all correspondence to this author. e-mail: leary@cmu.edu
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Abstract

Magnetic nanocomposites, annealed under stress, are investigated for application in inductive devices. Stress annealed Co-based metal/amorphous nanocomposites (MANCs) previously demonstrated induced magnetic anisotropies greater than an order of magnitude larger than field annealed Co-based MANCs and response to applied stress twice that of Fe-based MANCs. Transverse magnetic anisotropies and switching by rotational processes impact anomalous eddy current losses at high frequencies. Here we review induced anisotropies in soft magnetic materials and show new Co-based MANCs having seven times the response to stress annealing as compared to Fe-based MANC systems. This response correlates with the alloying of early transition metal elements (TE) that affect both induced anisotropies and resistivities. At optimal alloy compositions, these alloys exhibit a nearly linear B–H loop, with tunable permeabilities. The electrical resistivity is not a function of processing stress but trends in electrical resistivity and induced anisotropy with choice and concentration of TE content are clearly resolved. Previously reported and record-level induced anisotropies, K u, ∼20 kJ/m3 (anisotropy fields, H K ∼ 500 Oe), in stress annealed Co-rich MANCs are increased to K u ∼ 70 kJ/m3 (H K > 1800 Oe) in new systems.

Keywords

magnetic propertiesnanoscale

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Journal of Materials Research , Volume 31 , Issue 20 , 28 October 2016 , pp. 3089 - 3107
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Copyright © Materials Research Society 2016 

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