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Enhanced spin-valve giant magneto-resistance in non-exchange biased sandwich films

Description/Abstract

A large giant magnetoresistance (GMR) value of 7.5% has been measured in simple NiFeCo(1)/Cu/NiFeCo(2) sandwich films grown on a 30 {angstrom} Cr seed layer. This spin-valve GMR effect is consistent with the differential switching of the two NiFeCo layers due to an enhanced coercivity of the NiFeCo(1) layer grown on the Cr seed layer. A change in growth texture of the NiFeCo(1) layer from fcc (111) to bcc (110) crystallographic orientation leads to an increase in magnetic anisotropy and an enhancement in coercivity. The GMR value increases to 8.7% when a thin CoFe interfacial enhancing layer is incorporated. Further enhancement in GMR values up to 14% is seen in the sandwich films by nano-oxide layer formation. The specular reflection at oxide/magnetic layer interface further extends the mean free path of spin-polarized electrons.

Creator/Author: Mao, M ; Cerjan, C ; Law, B ; Grabner, F ; Miloslavsky, L ; Chien, C
Publication Date:2000 Feb 17
OSTI Identifier:OSTI ID: 756889
Report Number(s):UCRL-JC-137664; YN0100000
DOE Contract Number:W-7405-ENG-48
Other Number(s):Other: YN0100000; TRN: AH200027%%97
Resource Type:Conference
Resource Relation:Conference: Intermag 2000, Toronto, Ontario (CA), 04/09/2000--04/13/2000; Other Information: PBD: 17 Feb 2000
Research Org:Lawrence Livermore National Lab., Livermore, CA (US)
Sponsoring Org:USDOE Office of Defense Programs (DP) (US)
Subject:36 MATERIALS SCIENCE; COMPOSITE MATERIALS; LAYERS; NICKEL ALLOYS; IRON ALLOYS; COBALT ALLOYS; COPPER; MAGNETORESISTANCE; COERCIVE FORCE
Country of Publication:United States
Language:English
Format: Size: 502 Kilobytes pages
Update Date:2008 Feb 05

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