Phys. Rev. Lett. Phys. Rev. A Phys. Rev. B Phys. Rev. C Phys. Rev. D Phys. Rev. E Phys. Rev. ST AB Phys. Rev. ST AB Rev. Mod. Phys. Phys. Rev. (Series I) Phys. Rev. Volume: Page/Article:

Phys. Rev. B 50, 3481–3484 (1994)

[Issue 5 – 1 August 1994 ]

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Increases in giant magnetoresistance by ion irradiation

David M. Kelly and Ivan K. Schuller

Department of Physics, 0319, University of California, San Diego, La Jolla, California 92093-0319

V. Korenivski and K. V. Rao

Department of Condensed Matter Physics, Royal Institute of Technology, 10044 Stockholm, Sweden

Kim K. Larsen and J. Bottiger

Institute of Physics and Astronomy, University of Århus, DK-8000 Århus, Denmark

E. M. Gyorgy and R. B. van Dover

AT&T Bell Laboratories, Murray Hill, New Jersey 07974

We have studied the effect of 500-keV Xe⁺ irradiation on the structure, magnetotransport, and magnetic properties of sputtered Fe/Cr multilayers. Initially, with increasing dosage the giant magnetoresistance (GMR) increases with a concomitant increase in the interfacial roughness as indicated by changes in the low-angle x-ray-diffraction spectra. At doses higher than 1 x 10¹³ ions/cm², the value of the GMR progressively decreases, corresponding to progressively increasing regions of the film which are ferromagnetically coupled. The resulting structural disorder increases the overall electronic scattering rate and hence the electrical resistance at these higher doses. These results demonstrate that increased interfacial scattering enhances the GMR and thus plays an important role in the mechanism determining the GMR in Fe/Cr superlattices.

©1994 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v50/p3481
DOI: 10.1103/PhysRevB.50.3481
PACS: 79.20.Nc, 73.50.Jt, 73.61.At, 75.70.Fr

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