Giant magnetoresistance in superlattices without bulk scattering

R. Schad; P. Beliën; G. Verbanck; K. Temst; V. V. Moshchalkov; Y. Bruynseraede; D. Bahr; J. Falta; J. Dekoster; G. Langouche

doi:10.1209/epl/i1998-00482-6

All issues

Volume 44 / No 3 (November I 1998)

Europhys. Lett., 44 3 (1998) 379-385

Abstract

Issue		Europhys. Lett. Volume 44, Number 3, November I 1998


Page(s)		379 - 385
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1998-00482-6
Published online		01 September 2002

Europhys. Lett., 44 (3), pp. 379-385 (1998)

Giant magnetoresistance in $\rm Fe/Cr$ superlattices without bulk scattering

R. Schad¹, P. Beliën², G. Verbanck², K. Temst², V. V. Moshchalkov², Y. Bruynseraede², D. Bahr³, J. Falta³, J. Dekoster⁴ and G. Langouche⁴

¹ Research Institute for Materials, KU Nijmegen - 6525 ED Nijmegen, The Netherlands
² Laboratorium voor Vaste-Stoffysika en Magnetisme, K.U. Leuven, 3001 Leuven, Belgium
³ Hamburger Synchrotronstrahlungslabor at DESY, Notkestr. 85, 22607 Hamburg, Germany
⁴ Instituut voor Kern- en Stralenfisika - K.U. Leuven, 3001 Leuven, Belgium

Received: 16 April 1998
Accepted: 17 September 1998

Abstract

The Giant Magnetoresistance (GMR) observed in magnetic multilayers is due to spin-dependent scattering of electrons at interfaces or bulk defects. In order to unambiguously separate these two possible contributions, we produced Fe/Cr superlattices with negligible bulk defects, thus providing only interface scattering. The vertical and lateral interface roughness parameters were quantitatively analysed using synchrotron X-ray diffraction and Conversion Electron Mößbauer Spectroscopy. The magnitude of the GMR effect depends on both the vertical roughness amplitude η and the step density n_step. We find a linear increase of the Giant Magnetoresistance with $\eta\times n_{\rm step}$ .

PACS: 75.70.Pa – Giant magnetoresistance / 68.35.Ct – Interface structure and roughness / 61.10.-i – X-ray diffraction and scattering

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