We report an observation of two-photon photoemission (2PPE) magnetic circular dichroism (MCD) near the Fermi level. The 2PPE MCD asymmetry from a perpendicularly magnetized Ni film on Cu(001) at the normal-incidence geometry gives a significant intensity (∼6%) comparable to that of the one-photon photoemission. The energy dependence of the 2PPE MCD asymmetry is essentially similar to that of the 1PPE MCD, which indicates that the initial and final states involved, not the intermediate state, play a dominant role for the MCD asymmetries. For the 2PPE MCD measurements the asymmetry shows a maximum of as much as ∼28% at the light incident angle of ∼45°.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||出版済み - 5 1 2009|
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