[20p-H111-1~9] Frontiers of new functional oxides -more oxide, beyond oxide-

[20p-H111-7] Magnetic Property Tuning Device Achieved by Redox Reaction of Fe₃O₄ Thin Film

〇Takashi Tsuchiya^1,2, Kazuya Terabe², Masanori Ochi¹, Tohru Higuchi¹, Minoru Osada², Yoshiyuki Yamashita², Shigenori Ueda², Masakazu Aono² (1.Tokyo Univ. Sci., 2.NIMS)

Keywords:ionics,magnetism

All-solid-state nanoionics device composed of Fe₃O₄ ferromagnetic thin film and Li⁺ ion conducting solid electrolyte was fabricated to tune magnetic properties and magnetoresistance (MR) which are key factors for creation of novel high-density magnetic storage devices. Electronic conductivity, magnetization, and MR were reversibly tuned by Li⁺ insertion and removal. The tuning of various properties in Fe₃O₄ was caused by an electron donation to Fe³⁺ ions. The present technique should lead us to novel class of magnetic devices based on the reversible switching of magnetization and spin polarization.