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Spin Current$
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Sadamichi Maekawa, Sergio O. Valenzuela, Eiji Saitoh, and Takashi Kimura

Print publication date: 2012

Print ISBN-13: 9780199600380

Published to Oxford Scholarship Online: December 2013

DOI: 10.1093/acprof:oso/9780199600380.001.0001

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Spin polarization in magnets

Spin polarization in magnets

(p.36) 5 Spin polarization in magnets
Spin Current

K. Takanashi

Y. Sakuraba

Oxford University Press

This chapter explains how the exchange splitting between up- and down-spin bands in ferromagnets unexceptionally generates spin-polarised electronic states at the Fermi energy. The quantity of spin polarisation P in ferromagnets is one of the important parameters for application in spintronics, since a ferromagnet having a higher P is able to generate larger various spin-dependent effects such as the magnetoresistance effect, spin transfer torque, spin accumulation, and so on. However, the spin polarisations of general 3d transition metals or alloys generally limit the size of spin-dependent effects. Thus, ‘half-metals’ attract much interest as an ideal source of spin current and spin-dependent scattering because they possess perfectly spin-polarised conduction electrons due to the energy band gap in either the up- or down-spin channel at the Fermi level.

Keywords:   ferromagnets, electronic states, fermi energy, spintronics, magnetoresistance effect, spin transfer torque, spin accumulation

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