Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Determining complex spin mixing conductance and spin diffusion length
  from spin pumping experiments in magnetic insulator/heavy metal bilayers   Magnetic insulators are promising materials for the development of
energy-efficient spintronics. Unlike metallic counterparts, the magnetic
insulators are characterized by imaginary part of the interfacial spin mixing
conductance as well in a bilayer with heavy metals and it is responsible for
the field-like toque in spin-orbit torque devices. Here, we study the
underlying theoretical constructs and develop a general strategy to determine
the complex spin mixing conductance from the experimental results of
ferromagnetic resonance and spin pumping. The results show that the imaginary
part of the spin mixing conductance can be one order more than the real part
and it matches the critical trend of spin mixing conductance with thickness of
the heavy metal. The interpretation of experimental results also indicates that
at small thicknesses the interface contribution becomes significant and bulk
diffusion model cannot explain the results. A thickness-dependent spin
diffusion length is necessary too that is tantamount to Elliott-Yafet spin
relaxation mechanism in the heavy metals. Also, we effectively explain the
experimental results while inserting a copper layer with varying thicknesses in
between the magnetic insulator and the heavy metal using spin-circuit
formalism.

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The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
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The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat