Spin-polarized electron energy loss spectroscopy: Difference between revisions
No edit summary |
No edit summary |
||
Line 1: | Line 1: | ||
{{expert-subject|physics|date=December 2009}} |
{{expert-subject|physics|date=December 2009}} |
||
'''Spin polarized electron energy loss spectroscopy''' or '''SPEELS''' is a |
'''Spin polarized electron energy loss spectroscopy''' or '''SPEELS''' is a technique used to measure the dispersion relation of the [[spin wave]]s, over the whole [[Brillouin zone]]. |
||
Spin waves are collective perturbations in magnetic solids. Their properties depend on their [[wavelength]] (or [[wave vector]]). For long wavelength (short wave vector) spin wave the resulting spin precession has a very low frequency and the spin waves can be treated [[Classical mechanics|classically]]. Ferromagnetic resonance (FMR) and Brillouin light scattering (BLS) experiments provide information about the long wavelength spin waves in ultrathin magnetic films and [[nanostructure]]s. If the wavelength is comparable to the [[lattice constant]], the spin waves are governed by the [[microscopic]] [[exchange coupling]] and a [[Quantum mechanics|quantum mechanical]] description is needed. Therefore, experimental information on these short [[wavelength]] (large wave vector) spin waves in ultrathin films is highly desired and may lead to fundamentally new insights into the [[spin dynamics]] in reduced dimensions in the future. |
Spin waves are collective perturbations in magnetic solids. Their properties depend on their [[wavelength]] (or [[wave vector]]). For long wavelength (short wave vector) spin wave the resulting spin precession has a very low frequency and the spin waves can be treated [[Classical mechanics|classically]]. Ferromagnetic resonance (FMR) and Brillouin light scattering (BLS) experiments provide information about the long wavelength spin waves in ultrathin magnetic films and [[nanostructure]]s. If the wavelength is comparable to the [[lattice constant]], the spin waves are governed by the [[microscopic]] [[exchange coupling]] and a [[Quantum mechanics|quantum mechanical]] description is needed. Therefore, experimental information on these short [[wavelength]] (large wave vector) spin waves in ultrathin films is highly desired and may lead to fundamentally new insights into the [[spin dynamics]] in reduced dimensions in the future. |
Revision as of 12:44, 18 December 2009
![]() | This article needs attention from an expert in physics. Please add a reason or a talk parameter to this template to explain the issue with the article.(December 2009) |
Spin polarized electron energy loss spectroscopy or SPEELS is a technique used to measure the dispersion relation of the spin waves, over the whole Brillouin zone.
Spin waves are collective perturbations in magnetic solids. Their properties depend on their wavelength (or wave vector). For long wavelength (short wave vector) spin wave the resulting spin precession has a very low frequency and the spin waves can be treated classically. Ferromagnetic resonance (FMR) and Brillouin light scattering (BLS) experiments provide information about the long wavelength spin waves in ultrathin magnetic films and nanostructures. If the wavelength is comparable to the lattice constant, the spin waves are governed by the microscopic exchange coupling and a quantum mechanical description is needed. Therefore, experimental information on these short wavelength (large wave vector) spin waves in ultrathin films is highly desired and may lead to fundamentally new insights into the spin dynamics in reduced dimensions in the future.
Up to now, the spin polarized electron energy loss spectroscopy, SPEELS, is the only technique which can be used to measure the dispersion of such short wavelength spin waves in ultrathin films and nanostructures.
The first experiment
For the first time Kirschner's group[1] in Max-Planck institute of Microstructure Physics[2] showed that the signature of the large wave vector spin waves can be detected by spin polarized electron energy loss spectroscopy (SPEELS).[3][4] Later, with a better momentum resolution, the spin wave dispersion was fully measured in 8 ML fcc Co film on Cu(001)[5] and 8 ML hcp Co on W(110),[6] respectively. Those spin waves were obtained up to the surface Brillouin zone (SBZ) at the energy range about few hundreds of meV. Another recent example is the investigation of 1 and 2 monolayer Fe films grown on W(110) and measured at 120 K and 300 K, respectively [7] [8].
References
- ^ http://www.mpi-halle.de/~wme1/
- ^ http://www/mpi-halle.de
- ^ M. Plihal, D. L. Mills, and J. Kirschner, Phys. Rev. Lett. 82, 2579 (1999).
- ^ H. Ibach, D. Bruchmann, R. Vollmer, M. Etzkorn, P. S. Anil Kumar, and J. Kirschner, Rev. Sci. Instrum. 74 4089 (2003).
- ^ R. Vollmer, M. Etzkorn, P. S. Anil Kumar, H. Ibach, and J. Kirschner, Phys. Rev. Lett. 91, 147201 (2003).
- ^ M. Etzkorn, P. S. Anil Kumar, W.X. Tang, Y. Zhang, and J. Kirschner, Phys. Rev. B 72, 184420 (2005).
- ^ W. X. Tang, Y. Zhang, I. Tudosa, J. Prokop, M. Etzkorn, and J. Kirschner, Phys. Rev. Lett. 99, 087202 (2007).
- ^ J. Prokop, W. X. Tang, Y. Zhang, I. Tudosa, T. R. F. Peixoto, Kh. Zakeri, and J. Kirschner, Phys. Rev. Lett. 102, 177206 (2009).