An effect of capping-layer material on interfacial anisotropy and thermal stability factor of MgO/CoFeB/Ta/CoFeB/MgO/capping-layer structure

M. Bersweiler; E. C.I. Enobio; S. Fukami; H. Sato; H. Ohno

doi:10.1063/1.5050486

An effect of capping-layer material on interfacial anisotropy and thermal stability factor of MgO/CoFeB/Ta/CoFeB/MgO/capping-layer structure

M. Bersweiler, E. C.I. Enobio, S. Fukami, H. Sato, H. Ohno

Tohoku University

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

We investigate the magnetic properties of a MgO/CoFeB/Ta/CoFeB/MgO/capping-layer (Ru or Ta) structure and properties of a magnetic tunnel junction with the structure as a free layer. By using Ru instead of Ta as the capping layer, interfacial anisotropy K_i increases by a factor of ∼2 and a smaller damping constant is obtained. The increase in K_i results in an enhancement of the thermal stability factor of the free layer with the Ru capping layer compared with that with the Ta capping layer in magnetic tunnel junctions.

Original language	English
Article number	172401
Journal	Applied Physics Letters
Volume	113
Issue number	17
DOIs	https://doi.org/10.1063/1.5050486
Publication status	Published - 2018 Oct 22

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abstract = "We investigate the magnetic properties of a MgO/CoFeB/Ta/CoFeB/MgO/capping-layer (Ru or Ta) structure and properties of a magnetic tunnel junction with the structure as a free layer. By using Ru instead of Ta as the capping layer, interfacial anisotropy Ki increases by a factor of ∼2 and a smaller damping constant is obtained. The increase in Ki results in an enhancement of the thermal stability factor of the free layer with the Ru capping layer compared with that with the Ta capping layer in magnetic tunnel junctions.",

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AU - Bersweiler, M.

AU - Enobio, E. C.I.

AU - Fukami, S.

AU - Sato, H.

AU - Ohno, H.

N1 - Funding Information: The authors thank J. Llandro, Y. Horikawa, T. Hirata, H. Iwanuma, and K. Goto for fruitful discussion and technical support. This work was supported by the R&D Project for ICT Key Technology of MEXT, ImPACT Program of CSTI, and JST-OPERA. Publisher Copyright: © 2018 Author(s).

PY - 2018/10/22

Y1 - 2018/10/22

N2 - We investigate the magnetic properties of a MgO/CoFeB/Ta/CoFeB/MgO/capping-layer (Ru or Ta) structure and properties of a magnetic tunnel junction with the structure as a free layer. By using Ru instead of Ta as the capping layer, interfacial anisotropy Ki increases by a factor of ∼2 and a smaller damping constant is obtained. The increase in Ki results in an enhancement of the thermal stability factor of the free layer with the Ru capping layer compared with that with the Ta capping layer in magnetic tunnel junctions.

AB - We investigate the magnetic properties of a MgO/CoFeB/Ta/CoFeB/MgO/capping-layer (Ru or Ta) structure and properties of a magnetic tunnel junction with the structure as a free layer. By using Ru instead of Ta as the capping layer, interfacial anisotropy Ki increases by a factor of ∼2 and a smaller damping constant is obtained. The increase in Ki results in an enhancement of the thermal stability factor of the free layer with the Ru capping layer compared with that with the Ta capping layer in magnetic tunnel junctions.

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An effect of capping-layer material on interfacial anisotropy and thermal stability factor of MgO/CoFeB/Ta/CoFeB/MgO/capping-layer structure

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