Влияние намагниченности на эффективность спиновой накачки в двухслойной структуре ферромагнетик-нормальный металл

Журнал экспериментальной и теоретической физики. 2020. Т. 157. С. 272–280.

Demidov V., Ацаркин В. А., Шайхулов Т.

The problem of spin current generation and transformation into electric signals in thin-film ferromagnet/
nonmagnetic metal bilayer structures is investigated. This direction is of considerable scientific interest
and promising for applications in spintronics. An LSMO/Pt structure consisting of an epitaxial film of ferromagnetic
manganite La2/3Sr1/3O3 grown on a single-crystal NdGaO3 substrate and coated with a platinum
film has been studied experimentally. The spin current was generated by the spin pumping method upon the
excitation of a ferromagnetic resonance in the ferromagnetic layer and was detected by the electric voltage USP
arising in the nonmagnetic metal layer due to the inverse spin Hall effect. Owing to its relatively low Curie
temperature (~350 K), using LSMO allowed the influence of ferromagnetic-layer magnetization on the spin
current generation to be studied in detail in the temperature range 100–350 K. In this case, the influence of
the shape of the ferromagnetic resonance line, which is the convolution of homogeneous (Lorentzian) spin
packets and inhomogeneous Gaussian broadening (Voigt model), was consistently taken into account. As a
result of our analysis of all the parameters defining USP, we have obtained the temperature dependence of the
mixed spin conductance, which has turned out to be approximately proportional to the ferromagnet magnetization
squared. This result is compared with existing theoretical models

Keywords: ferromagnetic resonance, ферромагнитный резонанс, spin current, спиновый ток, spin conductance, спиновая проводимость