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

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

研究成果: Article査読

抄録

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.

本文言語English
論文番号07C905
ジャーナルJournal of Applied Physics
111
7
DOI
出版ステータスPublished - 2012 4 1

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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