From soft to hard magnetic Fe-Co-B by spontaneous strain: a combined first principles and thin film study

Reichel, L.IFW Dresden, D-01171 Dresden, Germany.;Tech Univ Dresden, Inst Mat Sci, Fac Mech Engn, D-01062 Dresden, Germany. (author)

From soft to hard magnetic Fe-Co-B by spontaneous strain : a combined first principles and thin film study

In order to convert the well-known Fe-Co-B alloy from a soft to a hard magnet, we propose tetragonal strain by interstitial boron. Density functional theory reveals that when B atoms occupy octahedral interstitial sites, the bcc Fe-Co lattice is strained spontaneously. Such highly distorted Fe-Co is predicted to reach a strong magnetocrystalline anisotropy which may compete with shape anisotropy. To probe this theoretical suggestion experimentally, epitaxial films are examined. A spontaneous strain up to 5% lattice distortion is obtained for B content up to 4 at%, which leads to uniaxial anisotropy constants exceeding 0.5 MJ m(-3). However, a further addition of B results in a partial amorphisation, which degrades both anisotropy and magnetisation.

Schultz, L.IFW Dresden, D-01171 Dresden, Germany.;Tech Univ Dresden, Inst Mat Sci, Fac Mech Engn, D-01062 Dresden, Germany. (author)
Pohl, D.IFW Dresden, D-01171 Dresden, Germany. (author)
Oswald, S.IFW Dresden, D-01171 Dresden, Germany. (author)
Faehler, S.IFW Dresden, D-01171 Dresden, Germany. (author)
Werwinski, MiroslawUppsala universitet,Materialteori(Swepub:uu)mirwe872 (author)
Edstrom, AlexanderUppsala universitet,Materialteori(Swepub:uu)aleed268 (author)
Delczeg-Czirjak, Erna K.Uppsala universitet,Materialteori(Swepub:uu)ernde783 (author)
Rusz, JanUppsala universitet,Materialteori(Swepub:uu)janru887 (author)
IFW Dresden, D-01171 Dresden, Germany.;Tech Univ Dresden, Inst Mat Sci, Fac Mech Engn, D-01062 Dresden, Germany.IFW Dresden, D-01171 Dresden, Germany. (creator_code:org_t)

By the author/editor: Reichel, L.; Schultz, L.; Pohl, D.; Oswald, S.; Faehler, S.; Werwinski, Miros ...; show more...; Edstrom, Alexand ...; Delczeg-Czirjak, ...; Rusz, Jan; show less...

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