Ferromagnetic Hall Effect at Optical Frequencies and Inner Effective Magnetic Field of Ferromagnetic Metals

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Abstract
The results of magneto‐optical measurements on Fe, Co, and Ni over a wide range of frequencies, varying from infrared to ultraviolet, have been analyzed. It is suggested that the magneto‐optical phenomena in ferromagnetic metals are caused by the influence of the inner effective magnetic field Hi (which is responsible for the static ferromagnetic Hall effect) on the motion of the current carriers. The previously detected infrared magneto‐optical resonance in Ni is interpreted according to this theory as the cyclotron resonance of the current carriers in the field Hi. A quantitative correlation of the static electrical conductivity and the ferromagnetic Hall constant is obtained by comparison of the magneto‐optical data with the results of direct measurements. The conclusion may lead to a change in the commonly accepted point of view of the origin of ferromagnetism in transition metals.

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