Co-Fe (Cobalt-Iron)

Predel, B.

doi:10.1007/10086082_911

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…org/JPhysCM/27/476002/mmedia) confirm the epitaxial growth without formation of twins. Compared to the position of the Fe 0.38 Co 0.62 (0 0 2) reflection given in literature[70],…”

mentioning

confidence: 84%

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

Reichel

Schultz

Pohl

et al. 2015

J. Phys.: Condens. Matter

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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.

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“…org/JPhysCM/27/476002/mmedia) confirm the epitaxial growth without formation of twins. Compared to the position of the Fe 0.38 Co 0.62 (0 0 2) reflection given in literature[70],…”

mentioning

confidence: 84%

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

Reichel

Schultz

Pohl

et al. 2015

J. Phys.: Condens. Matter

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“…The described relaxation ends when a final value of a is reached, where no more changes in the lattice occur. For the binary film, this final value is equal to the equilibrium lattice parameter 21 . The described mechanisms are also observed on the c/a curve in Fig.…”

Section: In Situ Observations During Fe-co(-c) Film Growthmentioning

confidence: 99%

Increased magnetocrystalline anisotropy in epitaxial Fe-Co-C thin films with spontaneous strain

Reichel

Giannopoulos

Kauffmann-Weiss

et al. 2014

Journal of Applied Physics

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Rare earth free alloys are in focus of permanent magnet research since the accessibility of the elements needed for nowadays conventional magnets is limited. Tetragonally strained iron-cobalt (Fe-Co) has attracted large interest as promising candidate due to theoretical calculations. In experiments, however, the applied strain quickly relaxes with increasing film thickness and hampers stabilization of a strong magnetocrystalline anisotropy. In our study we show that already 2 at% of carbon substantially reduce the lattice relaxation leading to the formation of a spontaneously strained phase with 3 % tetragonal distortion. In these strained (Fe 0.4 Co 0.6 ) 0.98 C 0.02 films, a magnetocrystalline anisotropy above 0.4 MJ/m 3 is observed while the large polarization of 2.1 T is maintained. Compared to binary Fe-Co this is a remarkable improvement of the intrinsic magnetic properties. In this paper, we relate our experimental work to theoretical studies of strained Fe-Co-C and find a very good agreement.

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