Exchange coupling and NOL magnetism consideration in Co1−xFex specular spin-valves

Doi, M.; Izumi, Masanori; Abe, Y.; Fukuzawa, H.; Fuke, H.N.; Iwasaki, H.; Sahashi, M.

doi:10.1016/j.jmmm.2004.10.063

Cited by 7 publications

(1 citation statement)

References 8 publications

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“…Since the ultrathin oxide layer has a nanoscaled thickness, we named it the nano-oxide-layer (NOL). Subsequently, we have reported on the CIP-GMR spin-valve films with NOL [21][22][23][24][25][26]. Since there is some prospect that the use of NOL can improve the MR ratio even for CPP-GMR spin-valve films, there have been reports on CPP-GMR spin-valve films with NOL.…”

Section: Introductionmentioning

confidence: 99%

CPP-GMR films with a current-confined-path nano-oxide layer (CCP-NOL)

Fukuzawa

Yuasa

Iwasaki

2007

J. Phys. D: Appl. Phys.

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We investigated the film performance and nanostructure of current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) spin-valve film with a current-confined-path nano-oxide layer (CCP-NOL). By applying ion-assisted oxidation (IAO) for the CCP-NOL formation, we enhanced the MR ratio to 5.4% at a small RA value of 500 mΩ µm2 for conventional Co90Fe10 layers. Furthermore, the use of bcc-Fe50Co50 also increased the MR ratio to 8.2% at a small RA value of 580 mΩ µm2. A modified Valet–Fert model for the CCP-NOL showed that the MR enhancement by the IAO is due to the improvement in resistivity of the CCP, and that by Fe50Co50 is due to a larger spin-dependent interface scattering effect. Analysis by cross-sectional TEM and three-dimensional atom probe confirmed the formation of the CCP-NOL structure. A reliability test for test element devices showed almost no change even under acceleration stress. The CPP-GMR spin-valve film with the CCP-NOL is extendable to future high-density recording heads due to its potential for a higher MR ratio at a small value of RA.

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Section: Introductionmentioning

confidence: 99%

CPP-GMR films with a current-confined-path nano-oxide layer (CCP-NOL)

Fukuzawa

Yuasa

Iwasaki

2007

J. Phys. D: Appl. Phys.

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Concentration and heat treatment effects on magnetoresistive properties of three-layer film systems based on FexСо100-x and Cu

et al. 2020

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Structural characterization of Co100−xFex nano-oxide layer

Endo

Doi

Hasegawa

et al. 2006

Journal of Applied Physics

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For the structural characterization of a Co100−xFex nano-oxide layer (NOL), the exchange bias properties of the Co100−xFex-natural oxidized NOL in the specular spin-valve (SPSV) system were investigated. The exchange bias energy (Jex) increased monotonically with the increasing Fe content for the Co100−xFex-NOL. The enhancement of both the magnetoresistance ratio and the exchange bias field (Hex) was realized by increasing the Fe content in the Co100−xFex-NOL. It should be mentioned that Hex more than 800Oe is obtained by the insertion of Co30Fe70-NOL, even in NOL-SPSV, which is a remarkably higher pinning field than that ever reported on IrMn-SV. This high exchange bias field is considered to be realized by the formation of an Fe-rich fcc phase at the interface of IrMn.

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Exchange coupling and NOL magnetism consideration in Co1−xFex specular spin-valves

Cited by 7 publications

References 8 publications

CPP-GMR films with a current-confined-path nano-oxide layer (CCP-NOL)

CPP-GMR films with a current-confined-path nano-oxide layer (CCP-NOL)

Concentration and heat treatment effects on magnetoresistive properties of three-layer film systems based on FexСо100-x and Cu

Structural characterization of Co100−xFex nano-oxide layer

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