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• W1520776615 abstract "We report measurements of the polar Kerr effect, proportional to the out-of-plane component of the magnetization, in thin films of the magnetically doped topological insulator ${({text{Cr}}_{0.12}{text{Bi}}_{0.26}{text{Sb}}_{0.62})}_{2}{text{Te}}_{3}$. Measurements of the complex Kerr angle ${mathrm{ensuremath{Theta}}}_{K}$ were performed as a function of photon energy in the range $0.8phantom{rule{4.pt}{0ex}}text{eV}<ensuremath{hbar}ensuremath{omega}<3.0phantom{rule{4.pt}{0ex}}text{eV}$. We observed a peak in the real part of ${mathrm{ensuremath{Theta}}}_{K}(ensuremath{omega})$ and zero crossing in the imaginary part that we attribute to a resonant interaction with a spin-orbit avoided crossing located $ensuremath{approx}1.6$ eV above the Fermi energy. The resonant enhancement allows measurement of the temperature and magnetic field dependence of ${mathrm{ensuremath{Theta}}}_{K}$ in the ultrathin film limit, $densuremath{ge}2$ quintuple layers (QL). We find a sharp transition to zero remanent magnetization at 6 K for $d<8$ QL, consistent with theories of the dependence of impurity spin interactions on film thickness and their location relative to topological insulator surfaces." @default.
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• W1520776615 date "2015-12-31" @default.
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• W1520776615 title "Resonant magneto-optic Kerr effect in the magnetic topological insulator<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>Cr</mml:mi><mml:mo>:</mml:mo><mml:mo>(</mml:mo><mml:msub><mml:mi mathvariant=normal>Sb</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mo>,</mml:mo><mml:msub><mml:mi>Bi</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:…" @default.
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• W1520776615 doi "https://doi.org/10.1103/physrevb.92.214440" @default.
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