Role of the nonmagnetic layer in determining the Landé g-factor in a spin-transfer system

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J.-S. Lee,¹ E. Vescovo,¹ C.-C. Kao,¹ J.-M. Beaujour,² A. D. Kent,² H. Jang,³ J.-Y. Kim,³ J.-H. Park,³ and J. H. Shim⁴
¹National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA
²Department of Physics, New York University, 4 Washington Place, New York, New York 10003, USA
³Department of Physics and PAL, Pohang University of Science and Technology, Pohang 790-784, South Korea
⁴Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, South Korea

Received 18 September 2009; published 2 November 2009

Themicroscopic origin of the Landé g-factor in two ferromagnetic/nonmagnetic (FM/NM)bilayer systems-Co/Cu and Ni/Pd-has been investigated using x-ray magnetic circulardichroism, resonant magnetic reflectivity, and band calculations. The FM/NM bilayerrepresents the building block of any complete spin-transfer structure (FM1/NM/FM2).The valence electronic structure is profoundly altered over a finitelength across the FM/NM interface. A considerable charge transfer takesplace from the NM to the FM material. This resultsin an enhancement of the orbital-to-spin magnetic moment ratio inthe FM layer and an induced magnetic polarization in theNM layer. Both effects turn out to be crucial fora correct understanding of the g-factor in spin-transfer systems.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.80.180403
DOI:	10.1103/PhysRevB.80.180403
PACS:	75.47.-m; 75.70.-i; 85.75.-d 75.47.-m Magnetotransport phenomena; materials for magnetotransport 75.70.-i Magnetic properties of thin films, surfaces, and interfaces 85.75.-d Magnetoelectronics; spintronics YEAR: 2009
KEYWORDS:	charge transfer states, cobalt, copper, electronic structure, ferromagnetic materials, ferromagnetic resonance, g-factor, interface magnetism, Landau levels, magnetic circular dichroism, magnetic moments, magnetic structure, magnetic thin films, metallic thin films, nickel, palladium, reflectivity, spin systems, valence bands

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