Induced Pt ferromagnetism in epitaxial trilayer films has been investigated by means of X-ray magnetic circular dichroism (XMCD) at the Pt -edges at various temperatures from to , including the metal-insulator transition temperature of ( ). At all the temperatures, we observed clear XMCD signals due to Pt ferromagnetism, the amplitude of which was determined to be at and at for the sample with the Pt thickness of . Interestingly, these values are comparable to or even greater than those in Pt/3 -ferromagnetic-metal (Fe, Ni, Co, and ) junction systems. The results can be interpreted in terms of a possible Fe interdiffusion into the Pt layer and also possible Fe-Pt alloying due to its high-temperature deposition.
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2019
Author(s)
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