Abstract
Magneto-optical polar Kerr effects in ultrathin bcc Fe(100) films sandwiched by Au layers were investigated in the 1.6-5.3 eV photon energy range at room temperature. A new peak appeared in the off-diagonal conductivity spectrum at around 3.5-4.5eV for the Fe films thinner than 10 A. The peak energy is lower for thinner Fe films. The absolute value of e xy at 3.7eV in the 3 A thick Fe film is 2 times as large as that in the bulk Fe
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