CoFe specular spin valves with a nano oxide layer

Kamiguchi, Y.; Yuasa, Hiromi; Fukuzawa, H.; Koui, K.; Iwasaki, H.; Sahashi, M.

doi:10.1109/intmag.1999.837392

Cited by 20 publications

(16 citation statements)

References 3 publications

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“…The specular reflection of the conduction electron [7] at the top surface was employed to improve further in spin-filter-spin valves. The Ta-cap layer was replaced by a Ta-oxide layer as a specular reflective layer.…”

Section: Performance Of Specular-spin-filter Headsmentioning

confidence: 99%

Read-write performance of spin-filter-spin-valve heads

et al. 2000

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The magneto-resistive properties of spin-filter-spinvalve (SV) films with a synthetic pinned structure were investigated. The spin-filter-SV films equipped with a high conductive back layer enhances 1 and 1 for ultra-thin free layer.Spin-filter-SV heads were fabricated and evaluated in order to verify advantages of the spin-filter structure. Spin-filter SV heads exhibit large read-back amplitude with stable asymmetry close to zero for ultra-thin free layer. The bias current dependence of the asymmetry also proved a validity of the spin-filter structure. Specular-spin-filter heads utilizing the surface specular reflection achieved 6.3 mV/ m of the normalized amplitude with 0.25 m read-track width.Index Terms-Spin filter, spin valve, synthetic pinned layer, specular, and magneto-resistive head.

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Section: Performance Of Specular-spin-filter Headsmentioning

confidence: 99%

Read-write performance of spin-filter-spin-valve heads

et al. 2000

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“…H IGH GMR was reported with spin-valve films with specular layers in both the free and pinned layers [1]- [3]. However, the coercivity of these films was higher than that of conventional spin-valve films.…”

Section: Introductionmentioning

confidence: 98%

Characteristics of spin-valve films with non-magnetic oxide layers for specular-scattering

Mizuguchi¹,

Kano²

2001

IEEE Trans. Magn.

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We found a new spin-valve structure in which low coercivity coexists with high GMR ratio is substrate/Ta/NiFe/PtMn/CoFe/Ru/Ox/CoFe/Cu/CoFe/Cu/Ta-O. "Ox" means that Ru layer surface was exposed to oxygen gas. In this structure, the free layer is separated from the top specular layer by a copper layer and shows no increase in coercivity. Furthermore, the free layer was well oriented due to the thin oxide layer in the bottom pinned layer and the coercivity did not increase. After annealing at 295 C, GMR and the exchange-bias field showed little change, which meant the oxide layers were stable. For the structure glass/ Ta [3 nm]/NiFe [2 nm]/PtMn [10 nm]/CoFe [1.5nm]/Ru [0.8 nm]/Ox/CoFe [2 nm]/Cu [2 nm]/CoFe [2 nm]/Cu [1 nm]/Ta-O [1 nm], GMR ratio of 14.9% and change in sheet resistance of 3.3 ohms were obtained. The coercivity of the free layer exhibited 0.4 Oe.

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“…Many researches focus on improving properties by controlling its interfacial microstructure [4][5][6][7][8][9][10]. It was first reported by Kamiguchi et al that the magnetoresistance ratio (MR) can be realized as high as 16% by oxidizing partial pinned CoFe layers or free CoFe layers [11]. It is believed that the enhancement of MR is due to the specular scattering of the NOL.…”

Section: Introductionmentioning

confidence: 99%

Effect of nano-oxide layers on the magnetoresistance of ultrathin permalloy films

2009

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Ta/NiFe/Ta ultrathin films with and without nano-oxide layers (NOLs) were prepared by magnetron sputtering followed by a vacuum annealing process. The influence of NOLs on the magnetoresistance (MR) ratio of ultrathin permalloy films was studied. The results show that the influence of grain size and textures on the MR ratio becomes weak when the thickness of the NiFe layer is below 15 nm. A higher MR ratio was observed for the thinner (< 15 nm) NiFe film with NOLs. The MR ratio of a 10 nm NiFe film can be remarkably enhanced by NOLs. The enhanced MR ratio for these ultrathin films can be attributed to the enhanced specular reflection of conduction electrons.

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CoFe specular spin valves with a nano oxide layer

Cited by 20 publications

References 3 publications

Read-write performance of spin-filter-spin-valve heads

Read-write performance of spin-filter-spin-valve heads

Characteristics of spin-valve films with non-magnetic oxide layers for specular-scattering

Effect of nano-oxide layers on the magnetoresistance of ultrathin permalloy films

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