講座主題：Development of Pb-free multiferroic crystals/thin films and domain switch by multi-field in multiferroic thin films using Scanning Probe Microscope
主講人： 木村秀夫
工作單位：煙臺大學環境與材料工程學院
活動時間：2021年9月10日 10：30-11:30
講座地點：環材學院三樓337會議室
主辦單位：煙臺大學環境與材料學院
內容摘要：
Multiferroic materials are possessed ferroelectric, ferromagnetic, and/or ferroelastic properties. The coupling between these properties enables dynamic manipulation, which is promising for broad applications in sensing, actuation, memory, etc. Numerous studies are carried out to investigate the coupling, especially the coupling between electric and magnetic orderings that would account for the magnetoelectric effect in multiferroic materials, due to fundamental physics and application potential in multiply controlled devices. It is succeeded switching of both ferroelectric and magnetic domains on Bi5Ti3FeO15 thin films applying electrical field using Scanning Probe Microscope. Here, Bi5Ti3FeO15 thin film is deposited on Pt/TiO2/SiO2/Si substrates using pulsed laser deposition. XRD, SEM and TEM results of the film show good crystalline property. Piezoresponse Force Microscope image and Magnetic Force Microscope image also show both ferroelectric and magnetic domain switching pattern which is written by not only electric field but also mechanical force in our study. The results confirmed the existence of room temperature coupling in Bi5Ti3FeO15, which is potentially useful for the computing applications.
主講人介紹：
木村秀夫，男，煙臺大學教授，長期從事功能晶體和薄膜材料的研究工作。曾擔任日本國立材料研究所環境能源材料部門磁電晶體課題組組長，并長期擔任日本學術振興會晶體生長分野理事、日本電子技術材料學會理事等。研究課題涉及鐵電多鐵存儲、能量采集、抗輻照涂層等應用領域。作為項目負責人承擔了日本文部省的GRENE計劃，作為首席研究員領導了能量采集的壓電材料（Piezoelectric Materials for Energy Harvesting）項目的研究工作，主持了無鉛壓電能量采集材料及高頻換能器的研發。加入國際空間特種材料研發團隊，主持了抗高溫抗輻照涂層材料的研究工作。近年來研究重心集中在多鐵性、磁阻挫、二維超導等多功能材料的研發上，在Adv. Mater., Nano Lett., NPG Asia Mater., Nano Energy等期刊發表論文200余篇。撰寫相關學術專著10部，授權國際專利26項。長期擔任長崎大學，真空理工，DEO研究所公司科技顧問。
