A.S. Sahakyan, R.M. Movsesyan, A.N. Kocharian
California State University,
Keywords: spin dependent transport, spin polarization, multilayered structures, noncollinearity, noncomplanarity
Summary:We consider structures consisting of repeating ferromagnetic and nonmagnetic layers. The periodicity of the potential profile, consisting of alternating magnetic barriers and non-magnetic quantum wells, is broken by noncollinearity or noncomplanarity of the magnetizations of neighboring magnetic layers. It is assumed that the non-magnetic quantum well shields the exchange magnetic interaction between the two adjacent barriers. Particular examples of such structures are the systems consisting of two "ferromagnetic domains" with canted magnetization vectors rotated relative to each other. In addition we also consider systems consisting of "antiferromagnetic pairs" or, e.g., of two or more "antiferromagnetic domains" with different orientations, including the two ferromagnetic or antiferromagnetic domains separated by "magnetic impurity "- when the magnetization of the barrier separating them - is oriented noncollinearly towards these domains. In these structures, besides the magnetic degrees of freedom described by the angles between the corresponding magnetizations, there exist other characteristics such as corresponding domain lengths that can influence the transport and polarization properties. The spin dependent transport and spin-polarizing properties in these magnetic multilayered structures are investigated. The variation of introduced degrees of freedom affects distinct physical properties of these multilayered nanostructures, by allowing these changes to appear in a controlled way.