Assembly of uniaxially aligned rare-earth-free nanomagnets

B. Balamurugan, B. Das, V. R. Shah, R. Skomski, X. Z. Li, D. J. Sellmyer

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64 Scopus citations


We report HfCo 7 nanoparticles with appreciable permanent-magnet properties (magnetocrystalline anisotropy K 1 ≈ 10 Mergs/cm 3, coercivity H c ≈ 4.4 kOe, and magnetic polarization J s ≈ 10.9 kG at 300 K) deposited by a single-step cluster-deposition method. The direct crystalline-ordering of nanoparticles during the gas-aggregation process, without the requirement of a high-temperature thermal annealing, provides an unique opportunity to align their easy axes uniaxially by applying a magnetic field of about 5 kOe prior to deposition, and subsequently to fabricate exchange-coupled nanocomposites having J s as high as 16.6 kG by co-depositing soft magnetic Fe-Co. This study suggests HfCo 7 as a promising rare-earth-free permanent-magnet alloy, which is important for mitigating the critical-materials aspects of rare-earth elements.

Original languageEnglish (US)
Article number122407
JournalApplied Physics Letters
Issue number12
StatePublished - Sep 17 2012

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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