Extremely surface-sensitive hysteresis loop measurement with a spin-polarized metastable helium atom beam

Kurahashi, M.; Suzuki, T.; Yamauchi, Y.
October 2004
Applied Physics Letters;10/4/2004, Vol. 85 Issue 14, p2869
Academic Journal
The sample current induced by the deexcitation of He* atoms on a ferromagnetic surface was found to depend on the He* spin direction. This spin dependence was used for measuring the hysteresis loop of an Fe film on Cu(100). The hysteresis loop is extremely surface specific because the spin dependence is due to the electron emission via the He* deexcitation that occurs on the vacuum side of the topmost surface layer. The hysteresis loop for a 2.2 ML Fe film on Cu(100) has been found to agree well with that measured with the surface magneto-optic Kerr effect.


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