Gigantic Photomagnetic Effect at Room Temperature in Spiropyran-Protected FePt Nanoparticles

Takashi Yamamoto, Elena A. Yurieva, Kento Tsuda, Tomoko Hosomi, Sergey M. Aldoshin, Yasuaki Einaga

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


A key issue in molecular electronics is the control of electronic states and properties by optical stimuli, which enables fast and high-density data storage. In this article, we report preparation of a photoswitchable room-temperature ferromagnetic material using FePt nanoparticles protected with a photochromic spiropyran ligand. Magnetic properties were examined with a field-dependent isothermal magnetization, and a photomagnetic effect was measured at room temperature. These measurements revealed room-temperature ferromagnetism and reversible switching of magnetization by 60% upon photochromic reaction of the spiropyran ligand. This gigantic photomagnetic effect is explained as spiropyran's large change in the dipole moment during photochromic reaction that tunes the magnitude of electron transfer at the interface.

Original languageEnglish
Article number1700161
JournalPhysica Status Solidi - Rapid Research Letters
Issue number9
Publication statusPublished - 2017 Sept


  • FePt
  • alloys
  • nanoparticles
  • photomagnetic effect
  • spiropyran

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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