Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalized Boundary Conditions for Spin Transfer   We develop a comprehensive description of static and dynamic spin-transfer
torque at interfaces between a normal metal and a magnetic material. Specific
examples of the latter include ferromagnets, collinear and noncollinear
antiferromagnets, general ferrimagnets, and spin glasses. We study the limit of
the exchange-dominated interactions, so that the full system is isotropic in
spin space, apart from a possible symmetry-breaking order. A general such
interface yields three coefficients (corresponding to three independent
generators of rotations) generalizing the well-established notion of the
spin-mixing conductance, which pertains to the collinear case. We develop a
nonequilibrium thermodynamic description of the emerging interfacial spin
transfer and its effect on the collective spin dynamics, while circumventing
the usual discussion of spin currents and net spin dynamics. Instead, our focus
is on the dissipation and work effectuated by the interface. Microscopic
scattering-matrix based expressions are derived for the generalized
spin-transfer coefficients.

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The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: astro-ph