Materials World Network: Magnetization Dynamics in Metallic Ferromagnetic Nanostructures
Final Report Abstract
This research project resulted in a number of discoveries in the physics of interactions between electrical current and spin waves in ferromagnetic nanostructures, some of which have direct applications in spin electronics (spintronics) technology. Under this project, we have shown that damping of spin waves in magnetic nanowires can be efficiently controlled by electrical currents via generation of socalled pure spin currents. We have shown that magnetic damping can be reduced to zero, which implies that spin waves can propagate in ferromagnetic nanowires over very long distances. This is an important result because spin waves are currently being considered for energy-efficient information processing in spin wave based logic devices. We have furthermore demonstrated that direct pure spin currents can excite selfoscillations of magnetization in ferromagnetic nanowires, which leads to microwave signal emission from these devices. This is promising for the development of ultra-compact wireless communication devices for autonomous micro-vehicles. Our studies have also established the proper boundary conditions for spin wave excitations in transversely magnetized ferromagnetic nanowires. These boundary conditions are important for quantitative prediction of the spin wave properties in the nanowire devices.
Publications
- Angular dependent ferromagnetic resonance analysis in a single micron sized cobalt stripe. J. Appl. Phys. 116, 033913-1–033913-6 (2014)
C. Schoeppner, K. Wagner, S. Stienen, R. Meckenstock, M. Farle, R. Narkowicz, D. Suter, J. Lindner
(See online at https://doi.org/10.1063/1.4890515) - Frequency-domain Magnetic Resonance – Alternative Detection Schemes for Samples at the Nanoscale. J. Surf. Interfac. Mater. 2, 46–68 (2014)
M. Möller, K. Lenz, J. Lindner
(See online at https://doi.org/10.1166/jsim.2014.1035) - Full Control of the Spin-Wave Damping in a Magnetic Insulator Using Spin-Orbit Torque. Phys. Rev. Lett. 113, 197203-1–197203-5 (2014)
A. Hamadeh, O. d’Allivy Kelly, C. Hahn, H. Meley, R. Bernard, A. H. Molpeceres, V. V. Naletov, M. Viret, A. Anane, V. Cros, S. O. Demokritov, J. L. Prieto, M. Muñoz, G. de Loubens, and O. Klein
(See online at https://doi.org/10.1103/PhysRevLett.113.197203) - Nanowire spin torque oscillator driven by spin orbit torques. Nat. Comm. 5, 5616-1–5616-7 (2014)
Z. Duan, A. Smith, L. Yang, B. Youngblood, J. Lindner, V. E. Demidov, S. O. Demokritov, I. N. Krivorotov
(See online at https://doi.org/10.1038/ncomms6616) - Spin-wave modes in permalloy/platinum wires and tuning of the mode damping by spin Hall current. Phys. Rev. B 90, 024427-1–024427-8 (2014)
Z. Duan, C. T. Boone, X. Cheng, I. N. Krivorotov, N. Reckers, S. Stienen, M. Farle, J. Lindner
(See online at https://doi.org/10.1103/PhysRevB.90.024427) - Reduction of phase noise in nanowire spin orbit torque oscillators. Sci Rep. 5, 16942-1–16942-10 (2015)
L. Yang L, R. Verba R, V. Tiberkevich , T. Schneider, A. Smith, Z. Duan, B. Youngblood, K. Lenz, J. Lindner, A. N. Slavin, I. N. Krivorotov
(See online at https://doi.org/10.1038/srep16942) - Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires. Phys. Rev. B 92, 104424-1 – 104424-10 (2015)
Z. Duan, I. N. Krivorotov, R. E. Arias, N. Reckers, S. Stienen, J. Lindner
(See online at https://doi.org/10.1103/PhysRevB.92.104424) - Generation of coherent spin-wave modes in yttrium iron garnet microdiscs by spin–orbit torque. Nat. Comm. 7, 10377-1–10377-8 (2016)
M. Collet, X. de Milly, O. d’Allivy Kelly, V. V. Naletov, R. Bernard, P. Bortolotti, J. Ben Youssef, V. E. Demidov, S. O. Demokritov, J. L. Prieto, M. Munoz, V. Cros, A. Anane, G. de Loubens, and O. Klein
(See online at https://doi.org/10.1038/ncomms10377)
