Abstract
Ferromagnetic resonance (FMR) is a magnetic resonance comparable to nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR); in these techniques the effect of a microwave irradiation is to flip the magnetic moments oriented in a magnetic field. Unlike EPR or NMR resonances, which operate on nuclear or electron spin, FMR concerns magnetic domains of a ferromagnetic material, i.e., the so-called Weiss domains. The first observation of FMR was reported by Griffiths in 1946(1) for electrolytically deposited films of iron, cobalt, and nickel. The first application to catalysis was made by Hollis and Selwood in 1961 on nickel-supported catalysts.(2) This technique can be used not only for ferromagnetic materials (metals and their alloys)(3,4) but also for ferrimagnetic materials (oxides such as garnets) (5) Usually, the magnetic moment, whose intensity depends on the Weiss domain volume as we shall see later on, is about three orders of magnitude greater than the magnetic moment of an electron. As a consequence, a quantum mechanical description of FMR phenomena is not necessary as it is for EPR or NMR spectroscopies. Furthermore, the temperature-dependent magnetization of ferromagnetic materials is at least three orders of magnitude more intense than in the case of paramagnetic materials. Therefore, though the FMR linewidths are usually very broad, this is the most sensitive spectroscopy for characterization (about one hundred times more sensitive than EPR).
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Bonneviot, L., Olivier, D. (1994). Ferromagnetic Resonance. In: Imelik, B., Vedrine, J.C. (eds) Catalyst Characterization. Fundamental and Applied Catalysis. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9589-9_7
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DOI: https://doi.org/10.1007/978-1-4757-9589-9_7
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