Direct observation and mapping of spin waves emitted by spin-torque nano-oscillators

Nature Materials

Volumn 9, Issue 12, 2010, Pages 984-988

  Demidov, Vladislav E ^a   Urazhdin, Sergei ^b   Demokritov, Sergej O ^a  

^a UNIVERSITY OF MÜNSTER   (Germany)

^b WEST VIRGINIA UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

DYNAMICAL SYSTEMS; MAGNETISM; MAPPING; MICROWAVE OSCILLATORS; SPIN WAVES; TORQUE; WAVE PROPAGATION;

ANISOTROPIC DISPERSION; DIRECT OBSERVATIONS; DIRECTIONAL EMISSION; FERROMAGNETIC LAYERS; MAGNETIC NANODEVICES; MAGNETORESISTANCE EFFECTS; SPIN TRANSFER TORQUE; TWO DIMENSIONAL MAPPING;

SPIN DYNAMICS;

EID: 78649994783     PISSN: 14761122     EISSN: 14764660     Source Type: Journal    
DOI: 10.1038/nmat2882     Document Type: Article

References (27)

1. Myers, E. B., Ralph, D. C., Katine, J. A., Louie, R. N. & Buhrman, R. A. Current-induced switching of domains in magnetic multilayer devices. Science 285, 867-870 (1999).
2. Katine, J. A., Albert, F. J., Buhrman, R. A., Myers, E. B. & Ralph, D. C. Current driven magnetization reversal and spin wave excitations in Co/Cu/Co pillars. Phys. Rev. Lett. 84, 4212-4215 (2000).
3. Tsoi, M. et al. Generation and detection of phase-coherent current-driven magnons in magnetic multilayers. Nature 406, 46-48 (2000).
4. Kiselev, S. I. et al. Microwave oscillations of a nanomagnet driven by a spin-polarized current. Nature 425, 380-383 (2003).
5. Urazhdin, S., Birge, N. O., Pratt, W. P. Jr & Bass, J. Current-driven magnetic excitations in permalloy-based multilayer nanopillars. Phys. Rev. Lett. 91, 146803 (2003).
6. 20 point contacts. Phys. Rev. Lett. 92, 27201 (2004).
7. Covington, M., Al Haj Darwish, M., Ding, Y., Gokemeijer, N. J. & Seigler, M. Current-induced magnetization dynamics in current perpendicular to the plane spin valves. Phys. Rev. B 69, 184406 (2004)
8. Krivorotov, I. N. et al. Time domain measurements of nanomagnet dynamics driven by spin-transfer torques. Science 307, 228-231 (2005).
9. Mancoff, F. B., Rizzo, N. D., Engel, B. N. & Tehrani, S. Phase-locking in double-point-contact spin-transfer devices. Nature 437, 389-392 (2005).
10. Kaka, S. et al. Mutual phase-locking of microwave spin torque nano-oscillators. Nature 437, 389-392 (2005).
11. Pufall, M. R., Rippard, W. H., Russek, S. E., Kaka, S. & Katine, J. A. Electrical measurement of spin-wave interactions of proximate spin transfer nanooscillators. Phys. Rev. Lett. 97, 087206 (2006).
12. Slonczewski, J. C. Current-driven excitation of magnetic multilayers. J. Magn. Magn. Mater. 159, L1-L7 (1996).
13. Berger, L. Emission of spin waves by a magnetic multilayer traversed by a current. Phys. Rev. B 54, 9353-9358 (1996)
14. Slavin, A. Microwave sources: Spin-torque oscillators get in phase. Nature Nanotechnol. 4, 479-480 (2009).
15. Slavin, A. & Tiberkevich, V. Spin wave mode excited by spin-polarized current in a magnetic nanocontact is a standing self-localized wave bullet. Phys. Rev. Lett. 95, 237201 (2005).
16. Hoefer, M. A., Ablowitz, M. J., Ilan, B., Pufall, M. R. & Silva, T. J. Theory of magnetodynamics induced by spin torque in perpendicularly magnetized thin films. Phys. Rev. Lett. 95, 267206 (2005).
17. Consolo, G. et al. Micromagnetic study of the above-threshold generation regime in a spin-torque oscillator based on a magnetic nanocontact magnetized at an arbitrary angle. Phys. Rev. B 78, 014420 (2008)
18. Hoefer, M. A., Silva, T. J. & Stiles, M. D. Model for a collimated spin-wave beam generated by a single-layer spin torque nanocontact. Phys. Rev. B 77, 144401 (2008)
19. Chen, X. & Victora, R. H. Phase locking of spin-torque oscillators by spin-wave interactions. Phys. Rev. B 79, 180402(R) (2009)
20. Berkov, D. V. & Gorn, N. L. Spin-torque driven magnetization dynamics in a nanocontact setup for low external fields: Numerical simulation study. Phys. Rev. B 80, 064409 (2009)
21. Demidov, V. E., Demokritov, S. O., Hillebrands, B., Laufenberg, M. & Freitas, P. P. Radiation of spin waves by a single micrometre-sized magnetic element. Appl. Phys. Lett. 85, 2866-2868 (2004).
22. Demokritov, S. O. & Demidov, V. E. Micro-Brillouin light scattering spectroscopy of magnetic nanostructures. IEEE Trans. Magn. 44, 6-12 (2008).
23. Demidov, V. E. et al. Magnon kinetics and Bose-Einstein condensation studied in phase space. Phys. Rev. Lett. 101, 257201 (2008).
24. Kalinikos, B. A. Excitation of propagating spin waves in ferromagnetic films. IEE Proc. H 127, 4 (1980).
25. Kalinikos, B. A. & Slavin, A. N. Theory of dipole-exchange spin-wave spectrum for ferromagnetic films with mixed exchange boundary conditions. J. Phys. C 19, 7013 (1986).
26. Ascroft, N. W. & Mermin, N. D. Solid State Physics Ch. 12 (Saunders College, 1976).
27. Northrop, G. A. & Wolfe, J. P. Ballistic phonon imaging in germanium. Phys. Rev. B 22, 6196-6212 (1980)