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Giant Magnetoresistance of (001) Fe / (001) Cr Superlattices

  • A. Barthelemy (a1), M. N. Baibich (a1), J. M. Broto (a1), R. Cabanel (a2), G. Creuzet (a2), P. Etienne (a2), A. Fert (a1), A. Friederich (a2), S. Lequien (a1), F. Nguyen Van Dau (a2) and K. Ounadjela (a1)...

Abstract

We recently reported the observation of a very large magnetoresistance in (001)Fe/(001)Cr superlattices grown by MBE. The magnetoresistance is found to be very large for thin Cr layers. We ascribe this magnetoresistance to a magnetic gate effect.

We recently reported the observation of a very large magnetoresistance in (001)Fe/(001)Cr superlattices with thin Cr layers [1]. A large magnetoresitance has also been observed in Fe/Cr/Fe sandwhiches [2]. In both cases, for Cr layers thinner than about 30 Å an antiparallel coupling of the magnetization of neighbor Fe layers is indicated by magnetic, magneto-optic and light scattering measurements [1–3]. It thus turns out that the large magnetoresistance os associated with the change to parallel alignment in an applied field. In this paper, we present new data on the magnetic and transport properties of Fe/Cr superlattics and we concentrate on the discussion of the microscopic origin of the magnetoresistance

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[1] Baibich, M.N., Broto, J.M., Fert, A., Nguyen Van Dau, F., Petroff, F., Etienne, P., Creuzet, G., Friederich, A., Chazelas, J., Phys. Rev. Letters 61, 2472 (1968).
[2] Binasch, G., Grünberg, P., Saurenbach, F., Zinn, W., to be published.
[3] Grünberg, P., Schreiber, R., Pang, Y., Brodsky, M.B., Sowers, H., Phys. Rev. Letters 57, 2442 (1986).
[4] Etienne, P., Creuzet, G., Friederich, A., Nguyen Van Dau, F., Fert, A. and Massies, J., Appl. Phys. Letters 5,. 162 (1968).
[5] Nguyen Van Dau, F., Fert, A., Hadjoudj, S., Etienne, P., Creuzet, G., Friederich, A., Proceeding of the International Conference on Magnetism. Paris, France, 1988 (to be published).Nguyen Van Dau, F., thesis (Orsay 1989, unpublished).
[6] Interface anisotropy effects turn out to be small, even for thin Fe 4 nM layers. The magnetization is in the layer plane and a field of about M is needed to align it in the perpendicular direction.
[7] The values of the saturation magnetization of our samples are scatter in the range 1300–1700 emu/cm3. The saturation magnetization of bulk Fe is 1700 emu/cm3. It may be that the lower value founds in Fe/Cr is due to a small negative contribution from Cr.
[8] Carbone, C. and Alvarado, S.F., Phys. Rev B36, 2433 (1987)
[9] Hinckey, L.L. and Mills, D.L., Phys. Rev. 633, 3329 (1986)
[10] Fert, A. and Campbell, I.A., I. Phys. F6. 849 (1976).
[11] Camley, R.E. and Barnas, J., preprint.

Giant Magnetoresistance of (001) Fe / (001) Cr Superlattices

  • A. Barthelemy (a1), M. N. Baibich (a1), J. M. Broto (a1), R. Cabanel (a2), G. Creuzet (a2), P. Etienne (a2), A. Fert (a1), A. Friederich (a2), S. Lequien (a1), F. Nguyen Van Dau (a2) and K. Ounadjela (a1)...

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