Persistent magnetic coherence in magnets
Source abstract
Abstract
When excited, the magnetization in a magnet precesses around the field in an anticlockwise manner on a timescale governed by viscous magnetization damping, after which any information carried by the initial actuation seems to be lost. This damping appears to be a fundamental bottleneck for the use of magnets in information processing. However, here we demonstrate the recall of the magnetization-precession phase after times that exceed the damping timescale by two orders of magnitude using dedicated two-colour microwave pump-probe experiments for a Y3Fe5O12 microstructured film. Time-resolved magnetization state tomography confirms the persistent magnetic coherence by revealing a double-exponential decay of magnetization correlation. We attribute persistent magnetic coherence to a feedback effect, that is, coherent coupling of the uniform precession with long-lived excitations at the minima of the spin-wave dispersion relation. Our finding liberates magnetic systems from the strong damping in nanostructures that has limited their use in coherent information storage and processing.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic properties of thin films · Magneto-Optical Properties and Applications · Quantum and electron transport phenomena
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (50)
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1. Landau, L. D. & Lifshitz, L. M. On the theory of the dispersion of magnetic permeability in ferromagnetic bodies. Phys. Z. Sowjetunion 8, 153–169 (1935).
2. Gilbert, T. L. Lagrangian formulation of the gyromagnetic equation of the magnetization field. Phys. Rev. 100, 1243 (1955).
3. Rezende, S. M. Fundamentals of Magnonics (Springer Nature, 2020).10.1007/978-3-030-41317-0 ↗
4. Jiao, H. J. & Bauer, G. E. W. Spin backflow and a.c. voltage generation by spin pumping and the inverse spin Hall effect. Phys. Rev. Lett. 110, 217602 (2013).10.1103/PhysRevLett.110.217602 ↗
5. Hahn, C. et al. Detection of microwave spin pumping using the inverse spin Hall effect. Phys. Rev. Lett. 111, 217204 (2013).10.1103/PhysRevLett.111.217204 ↗
6. Wei, D., Obstbaum, M., Ribow, M., Back, C. H. & Woltersdorf, G. Spin Hall voltages from a.c. and d.c. spin currents. Nat. Commun. 5, 3768 (2014).10.1038/ncomms4768 ↗
7. Hyde, P. et al. Electrical detection of direct and alternating spin current injected from a ferromagnetic insulator into a ferromagnetic metal. Phys. Rev. B 89, 180404(R) (2014).10.1103/PhysRevB.89.180404 ↗
8. Weiler, M., Shaw, J. M., Nembach, H. T. & Silva, T. J. Phase-sensitive detection of spin pumping via the a.c. inverse spin Hall effect. Phys. Rev. Lett. 113, 157204 (2014).10.1103/PhysRevLett.113.157204 ↗
9. Tserkovnyak, Y., Brataas, A. & Bauer, G. E. W. Enhanced Gilbert damping in thin ferromagnetic films. Phys. Rev. Lett. 88, 117601 (2002).10.1103/PhysRevLett.88.117601 ↗
10. Mizukami, S., Ando, Y. & Miyazaki, T. Effect of spin diffusion on Gilbert damping for a very thin permalloy layer in Cu/permalloy/Cu/Pt films. Phys. Rev. B 66, 104413 (2002).10.1103/PhysRevB.66.104413 ↗
11. Azevedo, A., Vilela-Leao, L. H., Rodriguez-Suarez, R. L., Oliveira, A. B. & Rezende, S. M. d.c. effect in ferromagnetic resonance: evidence of the spin-pumping effect? J. Appl. Phys. 97, 10C715 (2005).10.1063/1.1855251 ↗
12. Saitoh, E., Ueda, M., Miyajima, H. & Tatara, G. Conversion of spin current into charge current at room temperature: inverse spin-Hall effect. Appl. Phys. Lett. 88, 182509 (2006).10.1063/1.2199473 ↗
13. Costache, M. V., Sladkov, M., Watts, S. M., van der Wal, C. H. & van Wees, B. J. Electrical detection of spin pumping due to the precessing magnetization of a single ferromagnet. Phys. Rev. Lett. 97, 216603 (2006).10.1103/PhysRevLett.97.216603 ↗
14. Valenzuela, S. O. & Tinkham, M. Direct electronic measurement of the spin Hall effect. Nature 442, 176–179 (2006).10.1038/nature04937 ↗
15. Kimura, T., Otani, Y., Sato, T., Takahashi, S. & Maekawa, S. Room-temperature reversible spin Hall effect. Phys. Rev. Lett. 98, 156601 (2007).10.1103/PhysRevLett.98.156601 ↗
16. Kajiwara, Y. et al. Transmission of electrical signals by spin-wave interconversion in a magnetic insulator. Nature 464, 262–266 (2010).10.1038/nature08876 ↗
17. Ando, K. et al. Inverse spin-Hall effect induced by spin pumping in metallic system. J. Appl. Phys. 109, 103913 (2011).10.1063/1.3587173 ↗
18. Makiuchi, T. et al. Parametron on magnetic dot: stable and stochastic operation. Appl. Phys. Lett. 118, 022402 (2021).10.1063/5.0038946 ↗
19. Shimizu, H., Hioki, T. & Saitoh, E. Numerical study on magnetic parametron under perpendicular excitation. Appl. Phys. Lett. 120, 012402 (2022).10.1063/5.0063103 ↗
20. Serga, A. A. et al. Parametrically stimulated recovery of a microwave signal stored in standing spin-wave modes of a magnetic film. Phys. Rev. Lett. 99, 227202 (2007).10.1103/PhysRevLett.99.227202 ↗
21. Kalinikos, B. A. & Slavin, A. N. Theory of dipole-exchange spin wave spectrum for ferromagnetic films with mixed exchange boundary conditions. J. Phys. C: Solid State Phys. 19, 7013 (1986).10.1088/0022-3719/19/35/014 ↗
22. Hurben, M. J. & Patton, C. E. Theory of magnetostatic waves for in-plane magnetized anisotropic films. J. Magn. Magn. Mater. 163, 39–69 (1996).10.1016/S0304-8853(96)00294-6 ↗
23. Damon, R. W. Relaxation effects in the ferromagnetic resonance. Rev. Mod. Phys. 25, 239 (1953).10.1103/RevModPhys.25.239 ↗
24. Bloembergen, N. & Wang, S. Relaxation effects in para- and ferromagnetic resonance. Phys. Rev. 93, 72 (1954).10.1103/PhysRev.93.72 ↗
25. Rezende, S. M., Azevedo, A., Lucena, M. A. & de Aguiar, F. M. Anomalous spin-wave damping in exchange-biased films. Phys. Rev. B 63, 214418 (2001).10.1103/PhysRevB.63.214418 ↗
26. Demidov, V. E. et al. Thermalization of a parametrically driven magnon gas leading to Bose–Einstein condensation. Phys. Rev. Lett. 99, 037205 (2007).10.1103/PhysRevLett.99.037205 ↗
27. Demidov, V. E. et al. Magnon kinetics and Bose–Einstein condensation studied in phase space. Phys. Rev. Lett. 101, 257201 (2008).10.1103/PhysRevLett.101.257201 ↗
28. Serga, A. A. et al. Bose–Einstein condensation in an ultra-hot gas of pumped magnons. Nat. Commun. 5, 3452 (2014).10.1038/ncomms4452 ↗
29. Rückriegel, A., Kopietz, P., Bozhko, D. A., Serga, A. A. & Hillebrands, B. Magnetoelastic modes and lifetime of magnons in thin yttrium iron garnet films. Phys. Rev. B 89, 184413 (2014).10.1103/PhysRevB.89.184413 ↗
30. Demokritov, S. O. et al. Bose–Einstein condensation of quasi-equilibrium magnons at room temperature under pumping. Nature 443, 430–433 (2006).10.1038/nature05117 ↗
31. Bozhko, D. et al. Supercurrent in a room-temperature Bose–Einstein magnon condensate. Nat. Phys. 12, 1057–1062 (2016).10.1038/nphys3838 ↗
32. Cherepanov, V., Kolokolov, I. & L’vov, V. The saga of YIG: spectra, thermodynamics, interaction and relaxation of magnons in a complex magnet. Phys. Rep. 229, 81 (1993).10.1016/0370-1573(93)90107-O ↗
33. Ordóñez-Romero, C. L. et al. Three-magnon splitting and confluence processes for spin-wave excitations in yttrium iron garnet films: wave vector selective Brillouin light scattering measurements and analysis. Phys. Rev. B 79, 144428 (2009).10.1103/PhysRevB.79.144428 ↗
34. Cunha, R. O. et al. Nonlinear dynamics of three-magnon process driven by ferromagnetic resonance in yttrium iron garnet. Appl. Phys. Lett. 106, 192403 (2015).10.1063/1.4921002 ↗
35. Elyasi, M., Saitoh, E. & Bauer, G. E. W. Stochasticity of the magnon parametron. Phys. Rev. B 105, 054403 (2022).10.1103/PhysRevB.105.054403 ↗
36. Hioki, T., Shimizu, H., Makiuchi, T. & Saitoh, E. State tomography for magnetization dynamics. Phys. Rev. B 104, L100419 (2021).10.1103/PhysRevB.104.L100419 ↗
37. Hillery, M., O’Connell, R. F., Scully, M. O. & Wigner, E. P. Distribution functions in physics: fundamentals. Phys. Rep. 106, 122 (1984).10.1016/0370-1573(84)90160-1 ↗
38. Leonhardt, U. Measuring the Quantum State of Light (Cambridge Univ. Press, 1997).
39. Jersch, J. et al. Mapping of localized spin-wave excitations by near-field Brillouin light scattering. Appl. Phys. Lett. 97, 152502 (2010).10.1063/1.3502599 ↗
40. Noack, T. B. et al. Evolution of room-temperature magnon gas: toward a coherent Bose–Einstein condensate. Phys. Rev. B 104, L100410 (2021).10.1103/PhysRevB.104.L100410 ↗
41. Yokoi, N. & Saitoh, E. Intermode depolarization correlation of magnons. Phys. Rev. B 103, 134401 (2021).10.1103/PhysRevB.103.134401 ↗
42. Nozue, T. et al. Fabrication of yttrium–iron–garnet/Pt multilayers for the longitudinal spin Seebeck effect. Appl. Phys. Lett. 113, 262402 (2018).10.1063/1.5046977 ↗
43. Bunyaev, S. A. et al. Spin-wave relaxation by eddy currents in Y3Fe5O12/Pt bilayers and a way to suppress it. Phys. Rev. Appl. 14, 024094 (2020).10.1103/PhysRevApplied.14.024094 ↗
44. Serha, R. O. et al. Low-damping spin-wave transmission in YIG/Pt-interfaced structures. Adv. Mater. Interfaces 9, 2201323 (2022).10.1002/admi.202201323 ↗
45. Jungfleisch, M. B. et al. Temporal evolution of inverse spin Hall effect voltage in a magnetic insulator-nonmagnetic metal structure. Appl. Phys. Lett. 99, 182512 (2011).10.1063/1.3658398 ↗
46. Guo, F., Belova, L. M. & McMichael, R. D. Parametric pumping of precession modes in ferromagnetic nanodisks. Phys. Rev. B 89, 104422 (2014).10.1103/PhysRevB.89.104422 ↗
47. Hahn, E. L. Spin Echoes. Phys. Rev. 80, 580 (1950).10.1103/PhysRev.80.580 ↗
48. Carr, H. Y. & Purcell, E. M. Effects of diffusion on free precession in nuclear magnetic resonance experiments. Phys. Rev. 94, 630 (1954).10.1103/PhysRev.94.630 ↗
49. Vansteenkiste, A. et al. The design and verification of MuMax3. AIP Adv. 4, 107133 (2014).10.1063/1.4899186 ↗
50. Leliaert, J. et al. Adaptively time stepping the stochastic Landau–Lifshitz–Gilbert equation at nonzero temperature: implementation and validation in MuMax3. AIP Adv. 7, 125010 (2017).10.1063/1.5003957 ↗