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Applied Physics Letters / Volume 96 / Issue 9 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 96, 092509 (2010); http://dx.doi.org/10.1063/1.3334720 (3 pages)

Large enhancement of anisotropic magnetoresistance and thermal stability in Ta/NiFe/Ta trilayers with interfacial Pt addition

Y. F. Liu1, J. W. Cai1, and L. Sun2

1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
2Department of Mechanical Engineering, University of Houston, Houston, Texas 77204, USA

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(Received 5 January 2010; accepted 4 February 2010; published online 3 March 2010)

Ta/NiFe/Ta trilayers, extensively used for anisotropic magnetoresistance (AMR) sensors, exhibit severely reduced MR ratio at small NiFe thickness and appreciable moment loss, especially after annealing. By inserting ultrathin Pt layers at the interfaces of the trilayers, AMR can be significantly enhanced for thin NiFe films due to the strong electron spin-orbit scattering at Pt/NiFe interfaces along with suppression of interfacial magnetic dead layers. Furthermore, the Pt layers also reduce Ta and NiFe interdiffusion and result in negligible moment loss and AMR degradation after annealing at 350 °C.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

annealing, chemical interdiffusion, enhanced magnetoresistance, ferromagnetic materials, iron alloys, magnetic moments, magnetic multilayers, magnetic thin films, metallic thin films, nickel alloys, platinum, spin-orbit interactions, tantalum, thermal stability

PACS

  • 75.47.Np

    Metals and alloys

  • 75.70.Cn

    Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

  • 75.50.Bb

    Fe and its alloys

  • 75.30.Cr

    Saturation moments and magnetic susceptibilities

  • 81.40.Ef

    Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization

  • 81.40.Rs

    Electrical and magnetic properties related to treatment conditions

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3334720

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    M. Kowalewski, W. H. Butler, N. Moghadam, G. M. Stocks, T. C. Schulthess, K. J. Song, J. R. Thompson, A. S. Arrott, T. Zhu, J. Drewes, R. R. Katti, M. T. McClure, and O. Escorcia, J. Appl. Phys. 87, 5732 (2000)JAPIAU000087000009005732000001.

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    M. Sakurai, Phys. Rev. B 50, 3761 (1994).


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