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1

Digitale Medien

Magnetoresistance and interlayer diffusion in PtMn spin valves upon postdeposition annealing (2001)

Kim, Young Keun ; Lee, Seong-Rae

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 89 (2001), S. 6907-6909

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We report annealing time effects on the microstructural evolution and resultant magneto-transport property changes in Ta/NiFe/CoFe/Cu/CoFe/PtMn/Ta spin valves comprising PtMn layer thicknesses ranging from 10 to 30 nm. Postdeposition annealing was performed at 270 °C up to 35 h. The blocking temperatures of samples with 20 nm PtMn and 30 nm PtMn layers were found to be 350 °C and 400 °C, respectively. The magnetoresistance and interlayer coupling field changes became large as annealing time increased, in particular, for samples with relatively thicker PtMn layers. The main cause of microstructural changes and property degradation was due to interlayer diffusion of atomic constituents such as Mn, most likely through grain boundaries. Light B doping (1 at. %) in both free and pinned CoFe layers was proven effective in terms of blocking diffusion processes. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1361260

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2

Digitale Medien

Magnetic properties of Pd/Co multilayer films studied by Hall effect : 37th Annual conference on magnetism and magnetic materials (1993)

Kim, Sangrok ; Lee, Seong Rae ; Chung, Jin Duck

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 73 (1993), S. 6344-6346

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The magnetic properties and Hall effects of Pd/Co multilayer films fabricated by thermal evaporation have been studied using the Hall hysteresis loop measurement. The polarity of the Hall hysteresis loops of Pd/Co multilayer changed between 4 and 5 monolayers (ML) of Pd. It was speculated that the reason for this phenomena is the change of the position of Fermi level of 3d band in Pd/1Co multilayer from lower half of the band to upper half of the band depending on the Pd thickness. The Hall resistivities as a function of Pd thickness were found to oscillate and the period of oscillation was about 5 ML of Pd. The change of saturation magnetization as a function of Pd thickness reflected the oscillatory behavior up to 7 ML of Pd and the enhanced Co moments were observed in the film with 4 or thicker ML of Pd.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.352643

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3

Digitale Medien

Structural and magnetoresistance characteristics of CoFe/Ag/NiFe/Ag composite discontinuous multilayers (2000)

Lee, Kwan-Hoon ; Lee, Seong-Rae ; Kim, Young Keun

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 77 (2000), S. 4199-4201

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The structural, magnetic, and giant magnetoresistance (GMR) behaviors of new types of composite multilayers were investigated. The main objective of this study was to accomplish high MR sensitivity while maintaining magnetic softness. The MR sensitivity of CoFe/Ag/NiFe/Ag multilayers was higher compared to CoFe/Ag multilayers mainly due to the switching field difference between NiFe and CoFe. The x-ray diffraction analysis and temperature dependence of Δρ provided evidence of the structural evolution in the CoFe/Ag/NiFe/Ag upon annealing. The temperature dependence of Δρ in CoFe/Ag/NiFe/Ag multilayers annealed for 1 min compared with as-deposited multilayers were reduced because the interface structure was sharpened and structural defects were reduced. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1334946

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4

Digitale Medien

Rapid ordering of Zr-doped FePt alloy films (2001)

Lee, Seong-Rae ; Yang, Sanghyun ; Kim, Young Keun

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 78 (2001), S. 4001-4003

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The magnetic properties and microstructural evolution of Zr-doped FePt alloy films prepared by dc-magnetron sputtering were investigated. Compared to an undoped Fe59Pt41 binary film, Zr-doped FePt alloy films showed accelerated ordering transformation kinetics accompanying smaller grains: we were able to fabricate a Zr-doped FePt film [e.g., (Fe59Pt41)97Zr3] possessing very fine grain size (5 nm in average) and high coercivity (7.3 kOe) within 10 min annealing at 500 °C. It is thought that the point defects and lattice strain introduced by Zr-doping activated the nucleation rate of the ordered phase. In particular, for Zr-doped FePt films containing less than 45 at. % Pt, the ordered L10 phase was decomposed into a disordered phase after excessive annealing due to the formation of a Pt–Zr compound, most likely Pt3Zr, that reduces the effective Pt content in the ordered phase. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1379591

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