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Tunneling magneto-resistance granular thin films deposited by thermo-ionic vacuum arc technique

I. MUSTATA1, A. ANGHEL1, C. P. LUNGU1,* , O. POMPILIAN1, V. KUNCSER2, G. SCHINTEIE2

Affiliation

  1. National Institute for Laser, Plasma and Radiation Physics, Bucharest-Magurele, P. O. Box MG67, 77125, Romania
  2. National Institute of Materials Physics Bucharest-Magurele, P. O. Box MG-7, 77125, Romania

Abstract

Co-MgO granular films presenting TMR effects were prepared by thermo-ionic vacuum arc method with the simultaneous ignition of plasma in Co and MgO vapors. Morphologic, structural and magnetic behaviors were analyzed in as prepared and annealed samples. The influence of the Co content on the magnetic properties of the prepared films was analyzed, in correlation with tunneling magneto-resistance effects. The tunneling magneto-resistance effect is maximal for certain Co content. This behavior was interpreted by the contrary effects of decreasing the average size of the magnetic grains, and hence the average inter-grains distance at higher Co relative content, and the enhanced magnetic disorder in very fine grains dispersed in the insulating matrix..

Keywords

Tunneling magnetoresistance, Granular film, Thermionic vacuum arc.

Submitted at: Nov. 29, 2007
Accepted at: Dec. 7, 2007

Citation

I. MUSTATA, A. ANGHEL, C. P. LUNGU, O. POMPILIAN, V. KUNCSER, G. SCHINTEIE, Tunneling magneto-resistance granular thin films deposited by thermo-ionic vacuum arc technique, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 12, pp. 3816-3820 (2007)