报告内容摘要：

The coexistence of electric polarization and magnetization in multiferroic materials provides great opportunities for realizing magnetoelectric coupling, including electric field control of magnetism, or vice versa, through a strain mediated magnetoelectric interaction effect in layered magnetic/ferroelectric multiferroic heterostructures. Strong magnetoelectric coupling has been the enabling factor for different multiferroic devices, which however have been elusive, particularly at RF/microwave frequencies. In this presentation, I will cover the most recent progress on different RF/microwave magnetic and multiferroic heterostructures and devices, including power efficient and non-volatile voltage control of magnetism, nanoelectromechanical system magnetoelectric sensors with picoTesla sensitivity by using FeGaB/AlN  thin-film magnetoelectric heterostructures, new integrated GHz magnetic and multiferroic inductors based on solenoid structures with FeGaB/Al2O3 and FeCoB/Al2O3 multilayers exhibiting >150% enhanced inductance and quality factor ~20 at GHz frequencies over their air core counterparts, power efficient voltage tunable magnetoelectric inductors with inductance tunability of 50%~150% at GHz, etc. At the same time, we will demonstrate other tunable multiferroic devices, including multiferroic voltage tunable bandpass filters, tunable bandstop filters, tunable phase shifters, multiferroic antennas, and spintronics, etc. These novel voltage tunable RF multiferroic devices show great promise for applications in radio frequency integrated circuits.

报告人简介：

Nian Sun is a professor at the Electrical and Computer Engineering Department, Northeastern University, and Director of the W.M. Keck Laboratory for Integrated Ferroics. He received his Ph.D. degree from Stanford University. Prior to joining Northeastern University, he was a Scientist at IBM and Hitachi Global Storage Technologies. Dr. Sun was the recipient of the NSF CAREER Award, ONR Young Investigator Award, the S?ren Buus Outstanding Research Award, etc. His research interests include novel magnetic, ferroelectric and multiferroic materials, devices and subsystems. He has over 170 publications and over 20 patents and patent disclosures. One of his papers was selected as the “ten most outstanding full papers in the past decade (2001~2010) in Advanced Functional Materials”. Dr. Sun has given over ~100 invited presentations or seminars He is an editor of IEEE Transactions on Magnetics, and a fellow of the Institute of Physics, and of the Institution of Engineering and Technology.

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