Giant oscillations in spin-dependent tunneling resistances as a function of barrier thickness in fully epitaxial magnetic tunnel junctions with a MgO barrier

Marukame, Takao; Ishikawa, Takayuki; Taira, Tomoyuki; Matsuda, Ken-ichi; Uemura, Tetsuya; Yamamoto, Masafumi

doi:10.1103/PhysRevB.81.134432


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Giant oscillations in spin-dependent tunneling resistances as a function of barrier thickness in fully epitaxial magnetic tunnel junctions with a MgO barrier

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Title:	Giant oscillations in spin-dependent tunneling resistances as a function of barrier thickness in fully epitaxial magnetic tunnel junctions with a MgO barrier
Authors:	Marukame, Takao Browse this author
	Ishikawa, Takayuki Browse this author
	Taira, Tomoyuki Browse this author
	Matsuda, Ken-ichi Browse this author
	Uemura, Tetsuya Browse this author
	Yamamoto, Masafumi Browse this author
Keywords:	oscillations in spin-dependent tunneling resistances
	MgO barrier
	epitaxial magnetic tunnel junctions
Issue Date:	27-Apr-2010
Publisher:	American Physical Society
Journal Title:	Physical Review B
Volume:	81
Issue:	13
Start Page:	134432-1
End Page:	134432-5
Publisher DOI:	10.1103/PhysRevB.81.134432
Abstract:	Giant oscillations in spin-dependent tunneling resistances as a function of MgO barrier thickness (tMgO) were observed for fully epitaxial magnetic tunnel junctions with Heusler alloy Co2Cr0.6Fe0.4Al electrodes and a MgO barrier. The oscillations in tunneling resistances were well approximated by a superposition of an exponential function of exp(atMgO+b) and a periodic function of 1+C cos[(2π/T)tMgO+φ] with significantly large amplitudes C∼0.16±0.01 even at 293 K for both parallel and antiparallel magnetization orientations. The period was found to be almost independent of temperature and bias voltage (V). The amplitudes C showed only weak dependence on V at least up to 0.2 V. These features should be a key to understand the origin of the pronounced oscillations.
Rights:	©2010 The American Physical Society
Type:	article
URI:	http://hdl.handle.net/2115/47474
Appears in Collections:	情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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