Quantum effects in the giant magnetoresistance (GMR) of magnetic multilayersстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We present a quantum-statistical theory using the Kubo formalism to describe both CIP (current in plane) and CPP (current perpendicular to the plane) giant magnetoresistance (GMR) of thin magnetic sandwiches. It is shown that GMR for both geometries oscillates with the thicknesses of the sandwich's layers due to the confinement of electrons in quantum wells. The deviation of the GMR dependence on the angle gamma between the magnetizations of successive layers from linear cos gamma dependence is predicted. It is shown that for CIP geometry this deviation is large only for a large value of the parameter (k(F)(up arrow) - k(F)(down arrow))/(k(F)(up arrow) + k(F)(down arrow)), where k(F)(up arrow(down arrow)) is the Fermi momentum of spin-up (down) electron, but for CPP GMR for noncollinear configuration of the magnetizations a new mechanism (interference between spin-up and spin-down electron waves) is predicted, and the deviation from linear cos gamma dependence in this case is large even for small values of the parameter (k(F)(up arrow) - k(F)(down arrow))/(k(F)(up arrow) + k(F)(down arrow)), but not for very large values of the parameter (k(F)(up arrow) - k(F)(down arrow))/(1/l(up arrow) + 1/l(down arrow)), where l(up arrow(down arrow)) is the mean free path for spin-up (down) electron.