• Martínez, A. A. Pérez
• Avilés-Félix, L.
• Aguirre, Myriam Haydee
• Rojassánchez, J. C.
• Goijman, D.
• Morbidel, Leonardo
• Torres, T. E.
• Milano, Julián
• Velázquez Rodriguez, Daniel
• Gómez, J. E.
• Torres, J. L. Ampuero

Abstract

<jats:title>Abstract</jats:title><jats:p>Controlling the damping parameter in metallic ferromagnetic thin films is a key step for spintronic applications in which spin currents are generated by spin pumping. The coexistence of two states with low and high damping constant values would allow to obtain states of high and low spin current intensity, respectively. We have fabricated Fe<jats:inline-formula><jats:tex-math/><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mrow/><mml:mrow><mml:mn>100</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math></jats:inline-formula>Co<jats:sub><jats:italic>x</jats:italic></jats:sub>/Ta (with nominal <jats:italic>x</jats:italic> = 0, 15, 20, 25, 30 and 35) bilayers in which the Fe<jats:inline-formula><jats:tex-math/><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mrow/><mml:mrow><mml:mn>100</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math></jats:inline-formula>Co<jats:sub><jats:italic>x</jats:italic></jats:sub> layers grow epitaxially and the Ta layer is polycrystalline. We have found the coexistence of Gilbert damping and two magnon scattering mechanisms linked to a sign change in the magnetocrystalline anisotropy constant that allows the manipulation of low and high intensity states of the measured inverse spin Hall effect voltage. Bilayers with lower Co concentrations (<jats:inline-formula><jats:tex-math/><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:mi>x</mml:mi><mml:mtext>⩽</mml:mtext></mml:mrow></mml:math></jats:inline-formula> 25%) present different relaxation mechanisms (isotropic Gilbert damping and two magnon scattering) and an extra ferromagnetic resonance linewidth broadening produced due to mosaicity. Bilayers with Co concentration <jats:inline-formula><jats:tex-math/><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:mi>x</mml:mi><mml:mo>&gt;</mml:mo></mml:mrow></mml:math></jats:inline-formula> 25% present a dominating Gilbert damping for all directions in the film plane. However, in this concentration range the damping constant is anisotropic and when the magnetic field is applied along the hard magnetization direction <jats:italic>α</jats:italic> increases ∼420% with respect to the value obtained for the easy magnetization direction. Coexistence of isotropic Gilbert damping and two magnon scattering generated spin currents 2.5 times larger when the field is applied along the hard magnetization axis compared to the value observed in the easy magnetization axis. Thesefindings make the Fe<jats:inline-formula><jats:tex-math/><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mrow/><mml:mrow><mml:mn>100</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math></jats:inline-formula>Co<jats:sub><jats:italic>x</jats:italic></jats:sub>/Ta system an excellent candidate for spintronic device applications.</jats:p>

Topics

• impedance spectroscopy
• thin film
• anisotropic
• isotropic
• magnetization