Dependence of spin-transfer switching characteristics in magnetic tunnel junctions with synthetic free layers on coupling strength

Masayuki Nishimura; Mikihiko Ogane; Hiroshi Naganuma; Nobuhito Inami; Tadashi Morita; Yasuo Ando

doi:10.1063/1.3672240

Dependence of spin-transfer switching characteristics in magnetic tunnel junctions with synthetic free layers on coupling strength

Masayuki Nishimura, Mikihiko Ogane, Hiroshi Naganuma, Nobuhito Inami, Tadashi Morita, Yasuo Ando

ENG - Applied Physics

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

Abstract

Dependence of spin-transfer switching characteristics on the interlayer exchange coupling strength in the MTJs with synthetic free layers of Co ₉₀Fe ₁₀/Ru/Co ₄₀Fe ₄₀B ₂₀ with strong coupling strength was investigated. In the MTJ with the relatively weakly coupled synthetic ferrimagnetic free layer, larger thermal stability (δ ₀) and lower intrinsic critical current density (J _c0) than those of the MTJ with the single free layer were observed. Meanwhile, in the MTJs with the strongly coupled synthetic ferri- or ferromagnetic free layers, very large δ ₀ and high J _c0 were observed probably due to high effective magnetic energy barrier. It was found that the MTJ with the relatively weakly coupled synthetic ferrimagnetic free layer is suitable for the STTRAM application.

Original language	English
Article number	07C905
Journal	Journal of Applied Physics
Volume	111
Issue number	7
DOIs	https://doi.org/10.1063/1.3672240
Publication status	Published - 2012 Apr 1

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.3672240

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Dependence of spin-transfer switching characteristics in magnetic tunnel junctions with synthetic free layers on coupling strength. / Nishimura, Masayuki; Ogane, Mikihiko ; Naganuma, Hiroshi; Inami, Nobuhito; Morita, Tadashi; Ando, Yasuo.

In: Journal of Applied Physics, Vol. 111, No. 7, 07C905, 01.04.2012.

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

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abstract = "Dependence of spin-transfer switching characteristics on the interlayer exchange coupling strength in the MTJs with synthetic free layers of Co 90Fe 10/Ru/Co 40Fe 40B 20 with strong coupling strength was investigated. In the MTJ with the relatively weakly coupled synthetic ferrimagnetic free layer, larger thermal stability (δ 0) and lower intrinsic critical current density (J c0) than those of the MTJ with the single free layer were observed. Meanwhile, in the MTJs with the strongly coupled synthetic ferri- or ferromagnetic free layers, very large δ 0 and high J c0 were observed probably due to high effective magnetic energy barrier. It was found that the MTJ with the relatively weakly coupled synthetic ferrimagnetic free layer is suitable for the STTRAM application.",

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AU - Morita, Tadashi

AU - Ando, Yasuo

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AB - Dependence of spin-transfer switching characteristics on the interlayer exchange coupling strength in the MTJs with synthetic free layers of Co 90Fe 10/Ru/Co 40Fe 40B 20 with strong coupling strength was investigated. In the MTJ with the relatively weakly coupled synthetic ferrimagnetic free layer, larger thermal stability (δ 0) and lower intrinsic critical current density (J c0) than those of the MTJ with the single free layer were observed. Meanwhile, in the MTJs with the strongly coupled synthetic ferri- or ferromagnetic free layers, very large δ 0 and high J c0 were observed probably due to high effective magnetic energy barrier. It was found that the MTJ with the relatively weakly coupled synthetic ferrimagnetic free layer is suitable for the STTRAM application.

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