科研动态
【学术报告】中国科学院物理所胡凤霞研究员:磁热材料与器件设计
发布时间:2019-12-27 浏览次数:0

主 讲 人 :胡凤霞     研究员

活动时间:12月28日14时30分    

地    点 :理科群2号楼B409

讲座内容:Solidstate refrigeration based on magnetocaloric, electrocaloric, mechanocaloriceffect (multicaloric effect) has attracted world-wide attention for itsenvironmental-friendly and energy-saving superiority over the conventionalvapor compression technique. Here, we report our recent progress on multi-fieldmodulated hysteresis loss and multicaloric effect for the materials withvarious magnetostructural transitions [1-5]. Our studies indicate thathydrostatic pressure is an effective way to dig the lattice contribution. Moreover, the contribution from interplay betweenspin and lattice, the so-called coupled caloric effect, plays an important rolein multicaloric effect driven by multi-field in materials withmagnetostructural transition. We firstly carried out experimental studies onthe coupled caloric effect of metamagnetic Heusler Ni-Mn-In alloys. On the other hand, hysteresis loss is a longstandingproblem harming refrigeration efficiency, which exists in most of giantmagnetocaloric materials. we reported a new way to reduce hysteresis loss bytaking FeRh as a model material. Utilizing strain memory effect to engineer themagnetization process of FeRh film, a nonvolatile large reduction of hysteresisloss was firstly demonstrated. As a result, effective refrigeration capacity increases to a new height through introducing externalmechanical work in a magnetic refrigeration cycle. This work is favorable for promotingrefrigeration application particularly in designing micro-devices.[1] F.R.Shen, F.X.Hu,B.G.Shen, et al, Mater. Horiz. DOI: 10.1039/c9mh01602c (2019).(IF:14.356)[2] K.M.Qiao, F.X.Hu, B.G.Shen,et al, Nano Energy 59, 285(2019).[3] F.X.Liang, F.X.Hu, B.G.Shen, et al, APLMater. 7, 051102 (2019).[4] Y. Liu, F. X. Hu, B. G. Shen, et al, Appl.Phys. Lett. 112, 012401 (2018).[5] Y. Y. Zhao, F.X.Hu,B.G.Shen, et al, J. Am. Chem. Soc.5, 137 (2015).
主讲人介绍:胡凤霞,1985年河北师范学院物理系本科毕业,2002年中国科学院物理研究所获博士学位,随后去香港大学物理系做博士后。2006年回到中国科学院物理所工作,2008年晋升研究员,现任课题组长。先后从事金属间化合物的结构、磁性、磁热效应的研究以及钙钛矿锰氧化物薄膜体系磁性和电输运性质的研究工作。自2000年至今,在J. Am. Chem. Soc.、 Adv. Mater.、Appl. Phys. Lett.、Phys. Rev. B等刊物发表学术论文150余篇,SCI引用超过4100次。获国际发明专利(美日欧)授权3项,中国发明专利授权20余项。目前为Phys. Rev. Lett.、Adv. Mater.、J. Am. Chem. Soc.、Phys. Rev. B、Appl. Phys. Lett.等期刊审稿人。获2014年度陈嘉庚技术科学奖、2012年度国家自然科学二等奖和2011年度北京市科学技术奖一等奖。指导博士研究生15名,其中3人获国家奖学金,1人获中国科学院院长奖学金优秀奖。