Ferromagnetic resonance
The ferromagnetic resonance ( FMR ) is a measuring method in the solid state physics . It describes the resonant absorption of electromagnetic radiation in a ferromagnet (e.g. iron ). It is similar to electron spin resonance (ESR) or nuclear magnetic resonance (NMR) processes.
history
In 1941 Wladimir Konstantinowitsch Arkadjew (1884–1953) succeeded in proving it experimentally. The first more comprehensive theoretical description goes back to the Russian physicists Lev Dawidowitsch Landau and Evgeni Michailowitsch Lifschitz .
application areas
FMR with the help of microwave spectroscopy has a resolution limit of 10 11 spins, but local methods with higher resolution also exist. It can be used to investigate the magnetic parameters of ferromagnetic films or layer systems (e.g. g-tensor, effective magnetization, anisotropies, damping parameters). Ferromagnetic materials have found wide use recently, e.g. B. in connection with spintronic components , in combination with superconducting materials or in components whose electrical resistance is dependent on the magnetization ( GMR effect ).
See also
literature
- SV Vonsovskii: Ferromagnetic Resonance: The Phenomenon of Resonant Absorption of a High-Frequency Magnetic Field in Ferromagnetic Substances . Pergamon , Oxford 1966.
Web links
- M. Hohmann, M. vd Driesch: 2.2 Ferromagnetic resonance. (PDF; 325 kB) In: Internship report: Microwave Spectroscopy. manuelhohmann.de , March 5, 2005, pp. 6-7 , accessed on July 12, 2016 .
- Microwave spectroscopy. Ferromagnetic resonance on co-films - overview of practical experiment. physnet.uni-hamburg, archived from the original on November 14, 2009 ; Retrieved July 12, 2016 .
- Research area Ferromagnetic Resonance (FMR). Ruhr University, Bochum, 1997, archived from the original on January 19, 2010 ; Retrieved July 12, 2016 .