Gigantic Photomagnetic Effect at Room Temperature in Spiropyran-Protected FePt Nanoparticles
Gigantic Photomagnetic Effect at Room Temperature in Spiropyran-Protected FePt Nanoparticles
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螺吡喃保护的 FePt 纳米颗粒在室温下的巨大光磁效应
DOI：
10.1002/pssr.201700161
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Einaga Yasuaki
中科院分区：
文献类型：
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作者：
Yamamoto Takashi;Yurieva Elena A.;Tsuda Kento;Hosomi Tomoko;Aldoshin Sergey M.;Einaga Yasuaki
分子电子学中的一个关键问题是通过光学刺激控制电子状态和性质，这使得快速和高密度的数据存储成为可能。在这篇文章中，我们报告了使用光致变色螺吡喃配体保护的FePt纳米颗粒制备光开关室温铁磁材料。用场依赖等温磁化来检查磁性，并且在室温下测量光磁效应。这些测量揭示了室温铁磁性和在螺吡喃配体的光致变色反应后60%的可逆磁化切换。这种巨大的光磁效应被解释为螺吡喃在光致变色反应过程中的偶极矩的巨大变化，从而调节了界面处电子转移的幅度。
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.