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MAGNETISM AND MAGNETORESISTANCE IN ELECTRODEPOSITED (L10) CoPt SUPERLATTICES

V. Georgescu1,* , M. Daub2

Affiliation

  1. Faculty of Physics, Al. I. Cuza University, Iasi, Romania
  2. Max-Planck-Institut für Mikrostrukturphysik, Halle

Abstract

Over the last few years, the Co/Pt nano-multilayered films have been extensively studied. Owing to their strong perpendicular magnetic anisotropy and their giant magnetoresistance, they are potential materials for high-density magneto-optic recording and for magnetic sensor applications. Our purpose is to perform a comparative investigation of the surface, structural, magnetic and electric properties of ordered (L10) CoPt alloys grown by electrolysis. The samples were electrodeposited on Pt (100) textured polycrystalline substrates from a bath containing CoSO4.H2O, K2PtCl6 and H3BO3 by a potentiostatic technique. Films were characterised using grazing incidence X-ray diffraction, scanning electron microscopy, and magnetoresistance in current-perpendicular-to-plane configuration and torsion magnetometry. Films consist in ordered (L10) CoPt plane crystallites with diameters in the range of 10 to 50 micrometers. Magnetic behaviour is characterised by an easy axis normal to the film plane concomitantly with an antiferromagnetic coupling of magnetic layers. For specific samples of ordered (L10) CoPt films, evidence is given regarding an appreciable magnetoresistance effect, of the order 8 – 30% in CPP (current perpendicular to plane) configuration. It can be explained in terms of antiferromagnetic coupling between Co layers..

Keywords

Electrodeposition, Thin films, Magnetic properties, Magnetic anisotropy, Magnetic susceptibility.

Submitted at: July 27, 2004
Accepted at: March 23, 2005

Citation

V. Georgescu, M. Daub, MAGNETISM AND MAGNETORESISTANCE IN ELECTRODEPOSITED (L10) CoPt SUPERLATTICES, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 2, pp. 853-858 (2005)