Nonlinear spin-wave dynamics and radiation properties of small Heusler devices
Final Report Abstract
This project explored fundamental issues of nonlinear spin dynamics and spin-wave radiation in Heusler compound based structures. The efforts were focused on the experimental study of micropatterned Co2Mn0.6Fe0.4Si (CMFS) films by means of Brillouin light scattering microscopy (µBLS) and advanced microwave characterization techniques. The main results are: Micromagnetic studies and theoretical explanation of peculiarities of the nonlinear spin-wave emission from a microwave driven spin-torque nano-oscillator (STNO). - Identification of Co2Mn0.6Fe0.4Si (CMFS) as a suitable Heusler compound, and successful microfabrication and integration of CMFS based microstructures into existing microwave circuitry for the utilization in magnonic transport. - Realization of long-distance spin-wave propagation in a micro-structured CMFS waveguide. The propagation with a decay length three times larger than in commonly used Ni81Fe19 (Permalloy) waveguides is a milestone in the field of magnon-spintronics. - Experimental determination of all relevant material parameters of the CMFS compound using optical characterization techniques. - First observation of nonlinear emission of spin-wave caustics by the edge modes of a spin-wave CMFS waveguide at twice and three times the applied frequency. - Determination of a significant contribution of intrinsic magnon-magnon scattering mechanisms to the magnetic damping in high quality Heusler compounds.
Publications
- Phys. Rev. B 84, (2011) 144424
F. Ciubotaru, A. A. Serga, B. Leven, B. Hillebrands, and L. Lopez-Diaz
(See online at https://doi.org/10.1103/PhysRevB.84.144424) - Appl. Phys. Lett. 100, (2012) 112402
T. Sebastian, Y. Ohdaira, T. Kubota, P. Pirro, T. Brächer, K. Vogt, A. A. Serga, H. Naganuma, M. Oogane, Y. Ando, and B. Hillebrands
(See online at https://doi.org/10.1063/1.3693391) - Phys. Rev. Lett. 110, (2013) 067201
T. Sebastian, T. Brächer, P. Pirro, A. A. Serga, B. Hillebrands, T. Kubota, H. Naganuma, M. Oogane, and Y. Ando
(See online at https://doi.org/10.1103/PhysRevLett.110.067201) - Phys. Rev. Lett. 113, (2014) 227601
P. Pirro, T. Sebastian, T. Brächer, A. A. Serga, T. Kubota, H. Naganuma, M. Oogane, Y. Ando, and B. Hillebrands
(See online at https://doi.org/10.1103/PhysRevLett.113.227601) - J. Phys. D: Appl. Phys. 48, (2015) 164015
T. Sebastian, Y. Kawada, B. Obry, T. Brächer, P. Pirro, D. A. Bozhko, A. A Serga, H. Naganuma, M. Oogane, Y. Ando, and B. Hillebrands
(See online at https://doi.org/10.1088/0022-3727/48/16/164015)
