[10a-E208-1~11] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardEnglish Presentation

[10a-E208-7] Strain control of Curie temperature in Ni/Co/Ni structure

〇Toshiaki Morita¹, Enda Xiao², Ryuhei Kohno³, Tmohiro Koyama^1,4,5, Terumasa Tadano², Daichi Chiba^1,3,4,5,6 (1.SANKEN, The Univ. of Osaka, 2.NIMS, 3.SRIS, Tohoku Univ., 4.CSRN, The Univ. of Osaka, 5.OTRI, The Univ. of Osaka, 6.CSIS, Tohoku Univ.)

Keywords:

strain,ferromagnetic phase transition,nano thin film

In this study, we demonstrate strain control of the Curie temperature in ferromagnetic Ni/Co/Ni thin films. The samples were deposited on polyimide substrates by magnetron sputtering, and their magnetic properties under tensile strain were investigated using anomalous Hall effect measurements. For a Ni(0.33 nm)/Co(0.07 nm)/Ni(0.33 nm) film, an almost linear Hall response was observed in the strain-free state. Under applied strain, however, a ferromagnetic hysteresis loop emerged at the same temperature. The Curie temperature, determined by Arrott plot analysis and power-law fitting, increased systematically with increasing strain. The origin of this strain effect will be discussed on the basis of first-principles calculations.