Velázquez Rodriguez, D. y Gómez , J.E. y Avilés-Félix, L. y Ampuero Torres, J.L. y Torres , T.E. y Pérez Martínez, A.A. y Morbidel , L. y Goijman, D. y Rojas Sánchez , J.C. y Aguirre, M.H. y Milano, J. y Butera, A. (2024) Mecanismos de relajación intrínsecos y extrínsecos para controlar la intensidad de la corriente de espín en bicapas Fe_100-x Co_x/Ta / Intrinsic and extrinsic relaxation mechanisms for controlling spin current intensity in Fe_100-x Co_x/Ta bilayers. Journal of Physics D: Applied Physics, 57 (39). pp. 1-19. ISSN 1361-6463
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Resumen en español
El control del parámetro de amortiguamiento en películas delgadas ferromagnéticas metálicas es un paso clave para aplicaciones espintrónicas en las que las corrientes de espín se generan por bombeo de espín. La coexistencia de dos estados con valores de constante de amortiguamiento bajos y altos permitiría obtener estados de intensidad de corriente de espín alta y baja, respectivamente. Hemos fabricado bicapas Fe_100-x Co_x/Ta (con x nominal = 0, 15, 20, 25, 30 y 35) en las que las capas Fe_100-x Co_x crecen epitaxialmente y la capa Ta es policristalina. Hemos encontrado la coexistencia del amortiguamiento tipo Gilbert y de mecanismos de dispersión de dos magnones vinculados a un cambio de signo en la constante de anisotropía magnetocristalina que permite la manipulación de estados de baja y alta intensidad del voltaje de efecto Hall de espín inverso medido. Las bicapas con concentraciones de Co más bajas ( x≤25%) presentan mecanismos de relajación diferentes (amortiguación de Gilbert isótropa y dispersión de dos magnones) y un ensanchamiento adicional del ancho de línea de resonancia ferromagnética producido debido a la mosaicidad. Las bicapas con concentración de Co x > 25% presentan una amortiguación de Gilbert dominante para todas las direcciones en el plano de la película. Sin embargo, en este rango de concentración la constante de amortiguamiento es anisotrópica y cuando el campo magnético se aplica a lo largo de la dirección de magnetización difícil α aumenta ∼420% con respecto al valor obtenido para la dirección de magnetización fácil. La coexistencia de amortiguamiento de Gilbert isotrópico y la dispersión de dos magnones generó corrientes de espín 2,5 veces mayores cuando el campo se aplica a lo largo del eje de magnetización dura en comparación con el valor observado en el eje de magnetización fácil. Estos hallazgos hacen del sistema Fe_100-x Co_x/Ta un excelente candidato para aplicaciones de dispositivos espintrónicos.
Resumen en inglés
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_100-x Co_x/Ta (with nominal x = 0, 15, 20, 25, 30 and 35) bilayers in which the Fe_100-x Co_x 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 ( x≤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 x > 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 α 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_100-x Co_x/Ta system an excellent candidate for spintronic device applications.
| Tipo de objeto: | Artículo |
|---|---|
| Editor: | IOP |
| Palabras Clave: | Ferromagnetic resonance; Resonancia ferromagnética; [Anisotropic damping; Amortiguación anisotrópica; spin current; Corriente de giro; spin pumping] |
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| Número de Identificación: | 10.1088/1361-6463/ad5b6d |
| Materias: | Física |
| Divisiones: | Gcia. de área de Investigación y aplicaciones no nucleares > Gcia. de Física > Ciencias de materiales > Resonancias magnéticas |
| Código ID: | 1287 |
| Depositado Por: | Marisa G. Velazco Aldao |
| Depositado En: | 12 Sep 2024 14:35 |
| Última Modificación: | 13 Sep 2024 09:58 |
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