Optimum thickness of soft magnetic phase in FePt/FeCo permanent magnet superlattices with high energy product and large magnetic anisotropy energy | Zendy

Sandeep Kumar Jain | Zendy; Bheema Lingam Chittari | Zendy; Vijay Kumar | Zendy

Open Access

Optimum thickness of soft magnetic phase in FePt/FeCo permanent magnet superlattices with high energy product and large magnetic anisotropy energy

Author(s) -

Sandeep Kumar Jain,

Bheema Lingam Chittari,

Vijay Kumar

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4943082

Subject(s) - superlattice , condensed matter physics , materials science , magnetic moment , magnetic anisotropy , magnet , anisotropy , magnetic energy , ab initio quantum chemistry methods , magnetic field , magnetization , physics , optics , quantum mechanics , molecule

Ab initio calculations on hard/soft (FePt)m/(FeCo)n, (m = 4, 6, 8 and n = 2-2m) magnetic superlattices show that the B2 type FeCo layers become anisotropic with varying interlayer spacing and enhanced magnetic moments. The average magnetic moment in superlattices is higher than in bulk FePt, resulting in high maximum energy product for (FePt)4/(FeCo)8 which is nearly double the calculated value for bulk FePt. The calculation of the magnetic anisotropy energy shows that the optimal thickness of the soft magnetic phase for good permanent magnet behaviour of the superlattice is less than ∼2 nm

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