Ferromagnetic resonance

The ferromagnetic resonance (FMR ) is a measurement method in solid state physics. It denotes the resonant absorption of electromagnetic radiation in a ferromagnet (eg iron ). It is similar to the method of electron spin resonance (ESR) or nuclear magnetic resonance (NMR).

History

1941 succeeded Vladimir Konstantinovich Arkadjew ( 1884-1953 ) of the experimental evidence. The first comprehensive theoretical description goes back to the Russian physicist Lev Davidovich Landau and Evgeny Mikhailovich Lifshitz.

Areas of application

The FMR using the microwave spectroscopy has about a resolution limit of 1011 spins, but there are also local methods with higher resolution. With it, you can see the magnetic parameters of ferromagnetic films or multilayer systems investigate (eg g - tensor, effective magnetization, anisotropy, damping parameters). Ferromagnetic materials have recently experienced a large application, such as in connection with Spintronikbauelementen, in combination with superconducting materials or devices whose electrical resistance of the magnetization depends (GMR effect).

Credentials

• SV Vonsovskii: Ferromagnetic Resonance: The Phenomenon of Resonant Absorption of a High-Frequency Magnetic Field in Ferromagnetic Substances. Pergamon, Oxford, 1966.