Presentation Information
[10p-N303-5]Magnetic Properties of Fe3O4 membranes Transferred from a SrTiO3 substrate
via dissolution of a BaO Sacrificial Layer
〇Daigo Matsubara1, Takahito Takeda1, Masaaki Tanaka1,2, Ohya Shinobu1,2 (1.Tokyo Univ., 2.CSRN, Tokyo Univ.)
Keywords:
membrane,oxide,Fe3O4
We investigate the magnetic properties of thin Fe3O4 membranes, which were transferred from a SrTiO3 (001) substrate onto a SiO2/Si substrate by using BaO as a water-soluble sacrificial layer. BaO is an easily grown binary compound and readily dissolves in water only within ~1 hour. The temperature dependence of the magnetization exhibits a peak at the Verwey transition temperature (118 K), which is lower than that reported for Fe3O4 thin films on SrTiO3 substrates (120 K). The decrease may result from enhanced superexchange interactions along the direction perpendicular to the substrate due to strain release. This facilitates the suppression of three-Fe-site polarons called trimerons - regarded as the origin of the Verwey transition - at lower temperatures. The use of BaO enabled the reproducible realization of the properties of thin Fe3O4 films, providing a platform for exploring intrinsic physical properties of thin films free from epitaxial strain for flexible device applications.