The interplay between NiMn/NiFe epitaxial growth and NiMn atomic ordering in NiMn/NiFe exchange biased layers: a structural perspective

Wong, Bunsen Y.; Mitsumata, Chiharu; Prakash, S.; Laughlin, David E.; Kobayashi, Toshikazu

doi:10.1109/20.538645

Cited by 26 publications

(7 citation statements)

References 9 publications

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“…Indeed, this has been suggested for NiMn. 16 To test this idea, we have performed diffraction measurements in which the penetration depth of the x rays is varied from about 3 nm up to Ͼ100 nm. 17 For the 10 and 15 nm MnPt spin valves ͑with fcc and L1 0 coexistence͒, we find that there is no dependence In this geometry, we are measuring planes perpendicular to the sample normal.…”

mentioning

confidence: 99%

Thickness dependence of exchange bias and structure in MnPt and MnNi spin valves

Toney

Samant

Lin

et al. 2002

Applied Physics Letters

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We describe x-ray diffraction and magnetic measurements of annealed MnPt and NiMn spin valves as a function of MnPt (NiMn) film thickness. Thin films (≲5–10 nm) are not chemically ordered and hence not antiferromagnetic, which explains the lack of exchange coupling in these films. With increasing thickness, the L10 chemical order develops (through coexistence between fcc and L10 phases) and there is a strong correlation between chemical order and exchange coupling. The lack of chemical order in the thin films is likely due to a lack of nucleation sites for the L10 phase.

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confidence: 99%

Thickness dependence of exchange bias and structure in MnPt and MnNi spin valves

Toney

Samant

Lin

et al. 2002

Applied Physics Letters

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“…1,2 Various Mn based AF alloys, such as FeMn, NiMn, and PtMn, have been used as exchange biasing layers in spin-valve structures. [3][4][5] Similar to NiMn, the AF phase of PtMn is the chemically ordered 6 L1 0 type structure, and the exchange coupling of PtMn/Ni 80 Fe 20 is expected to be sensitive to the details of the crystal structure. Previously we reported 7 a biaxial exchange anisotropy phenomenon in PtMn/Ni 80 Fe 20 bilayers grown on a ͑nonstep͒ Mo͑001͒ surface on MgO͑001͒ substrate.…”

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confidence: 99%

Step surface induced unidirectional exchange anisotropy in PtMn/Ni80Fe20 on Mo(001)

Yu¹,

Huang²,

Yao³

2002

Journal of Applied Physics

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Exchange anisotropy for a PtMn/Ni80Fe20 bilayer grown on a Mo(001) step surface is studied. The PtMn/Ni80Fe20 bilayers were mainly grown as a (110) quad-crystal structure mixed with a minor (001) component. The PtMn/Ni80Fe20 bilayers show a unidirectional exchange anisotropy with exchange field up to about 190 Oe with easy axis parallel to the underlying Mo step-edge direction. The azimuthal distribution of the exchange field is explained by interplay of a step-induced unidirectional anisotropy and crystalline-induced anisotropy.

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“…The H ex of BSV remains constant at 1180 Oe up to 140 °C, and then falls to zero at 270 °C. Especially, the BSV exhibits a higher blocking temperature of 270 °C, and a MR ratio of 3.6%, and an H ex of 1180 Oe, which is the highest ever reported for other post-annealing AFM films, such as NiMn and PtMn [1,7].…”

Section: Methodsmentioning

confidence: 82%

“…Therefore, exchange coupled IrMn(~80 Å)/CoFe bilayer is suitable for narrow gap head structure [2,6], since IrMn shows a high H ex at smaller layer thickness than other ordered AFM films, such as NiMn and PtMn [1,7].…”

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confidence: 99%

The effect of cyclic annealing treatments on magnetoresistance in IrMn‐pinned top and bottom spin valves

Rhee

Kim

Hwang

et al. 2004

phys. stat. sol. (c)

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PACS 75.70.CnIrMn-pinned top spin valve (TSV) and bottom spin valve (BSV) films were prepared by DC magnetron sputtering onto thermally oxidized Si (111) substrates at room temperature under a magnetic field of above 100 Oe. The effect of cyclic annealing treatments on magnetoresistive and structural properties in the films was investigated. The exchange coupling field (H ex ) of TSV and BSV is stabilized after the second annealing cycle and it is thought that these films reveal high thermal stability. The magnetoresistance (MR) ratio and H ex of TSV were 5.6% and 430 Oe, respectively. For BSV the H ex value (1180 Oe) is much higher while MR ratio (3.6%) is reduced with respect to TSV. The blocking temperatures of the TSV and BSV were 250 °C and 270 °C, respectively. The results concerning magnetic properties together with structural investigations suggest the H ex is mainly dependent on the quality of fcc (111) crystalline texture while MR is sensitive to both crystalline texture and interface roughness.

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The interplay between NiMn/NiFe epitaxial growth and NiMn atomic ordering in NiMn/NiFe exchange biased layers: a structural perspective

Cited by 26 publications

References 9 publications

Thickness dependence of exchange bias and structure in MnPt and MnNi spin valves

Thickness dependence of exchange bias and structure in MnPt and MnNi spin valves

Step surface induced unidirectional exchange anisotropy in PtMn/Ni80Fe20 on Mo(001)

The effect of cyclic annealing treatments on magnetoresistance in IrMn‐pinned top and bottom spin valves

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