Temperature dependence of giant magnetoresistance and magnetic properties in electrodeposited $\mathrm{Co}\text{\ensuremath{-}}\mathrm{Cu}∕\mathrm{Cu}$ multilayers: The role of superparamagnetic regions

Temperature dependence of giant magnetoresistance and magnetic properties in electrodeposited $Co − Cu ∕ Cu$ multilayers: The role of superparamagnetic regions

L. Péter, Z. Rolik, L. F. Kiss, J. Tóth, V. Weihnacht, C. M. Schneider, and I. Bakonyi

Phys. Rev. B 73, 174410 – Published 9 May 2006

Abstract

We have shown recently that both the magnetization and the magnetoresistance of electrodeposited $Co − Cu ∕ Cu$ multilayers can be decomposed by assuming the presence of both ferromagnetic (FM) and superparamagnetic (SPM) regions in the magnetic layers. In the present work, for two selected samples, one with a large SPM and another one with a large FM contribution to the giant magnetoresistance, low temperature magnetic and magnetoresistance measurements were performed in order to reveal the evolution of the FM and SPM terms with temperature. The average apparent magnetic moment of the SPM regions deduced from the two sets of data showed a good agreement. The role of electrochemical processes in the formation of the SPM regions is discussed. An attempt has also been made to elaborate on some models for the spatial distribution of the constituent elements (Co and Cu) leading to the occurrence of SPM regions. The results are discussed also in the framework of interacting SPM regions.

Received 19 October 2005

DOI:https://doi.org/10.1103/PhysRevB.73.174410

Authors & Affiliations

L. Péter^1,*, Z. Rolik^1,†, L. F. Kiss¹, J. Tóth¹, V. Weihnacht^1,‡, C. M. Schneider^2,§, and I. Bakonyi¹

¹Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences. H-1525 Budapest, P.O.B. 49, Hungary
²Institute for Solid State Research (IFF-IEE), Research Centre Jülich, D-52425 Jülich, Germany

^*Corresponding author. Email address: lpeter@szfki.hu
^†Undergraduate student at Eötvös University, Budapest during the course of this work. Present address: Eötvös University, Department of Theoretical Chemistry, Budapest, Hungary.
^‡On leave from the Leibniz Institute for Solid State and Materials Research (IFW), Dresden, Germany. Present address: Fraunhofer Institute for Material and Beam Technology, Dresden, Germany.
^§Formerly at: Leibniz Institute for Solid State and Materials Research (IFW), Dresden, Germany.

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Vol. 73, Iss. 17 — 1 May 2006

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Physical Review B

covering condensed matter and materials physics

Temperature dependence of giant magnetoresistance and magnetic properties in electrodeposited $Co − Cu ∕ Cu$ multilayers: The role of superparamagnetic regions

L. Péter, Z. Rolik, L. F. Kiss, J. Tóth, V. Weihnacht, C. M. Schneider, and I. Bakonyi

Phys. Rev. B 73, 174410 – Published 9 May 2006

Abstract

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Physical Review B

covering condensed matter and materials physics

Temperature dependence of giant magnetoresistance and magnetic properties in electrodeposited Co−Cu∕Cu multilayers: The role of superparamagnetic regions

L. Péter, Z. Rolik, L. F. Kiss, J. Tóth, V. Weihnacht, C. M. Schneider, and I. Bakonyi

Phys. Rev. B 73, 174410 – Published 9 May 2006

Abstract

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Temperature dependence of giant magnetoresistance and magnetic properties in electrodeposited $Co − Cu ∕ Cu$ multilayers: The role of superparamagnetic regions