磁学实验室学术报告(2016-9)

来源:   发布时间:2016-09-13


报告人:Prof. Imre Bakonyi,Wigner Research Centre for Physics, Hungarian Academy of Sciences
报告时间:2016年9月14日(星期三)  下午 3:00—5:00
报告地点:中科院物理所M楼236
联系人:  胡凤霞研究员(9233)
 
题目一:Giant magnetoresistance in magnetic nanostructures: a unified view on granular and multilayer systems
 
报告摘要
In the present contribution, we intend to give a description of the spin-dependent scattering processes which form the basis
for explaining the phenomenon of giant magnetoresistance (GMR) occurring in various magnetic nanostructures
(ferromagnetic/non-magnetic multilayers and granular magnetic alloys). The talk will also describe briefly the preparation of
multilayers by electrodeposition and present our main results on their GMR behavior based on our review paper [I. Bakonyi
and L. Péter: Electrodeposited multilayer films with giant magnetoresistance (GMR): progress and problems. Progr. Mater. Sci. 55, 107-245 (2010)].
 
题目二:Atomic Volumes of Metallic Glasses And Their Relevance For The Magnetism Of Fe-Rich Amorphous Alloys
 
报告摘要
We have analyzed the composition dependence of average atomic volume for early and late transition metal (TE-TL type) and metal-metalloid
(TL-MD type) amorphous alloys (TE=Ti, Zr, Hf; TL=Fe, Co, Ni; MD=B, P). From this analysis, the atomic volumes assigned to the constituent alloy
species could be derived [I. Bakonyi, Acta. Mater. 53, 2509 (2005)]. In the first part of this talk, these results will be presented and their implications
for the local atomic structure and chemical disorder of metallic glasses will be discussed. In the second part of the talk, a comparison will be made
between the atomic volumes assigned to Fe in Fe-rich Fe-MD and Fe-Zr alloys and this comparison will provide some hints at understanding the
peculiar magnetic properties (e.g., reentrant behavior) reported for Fe-rich Fe-Zr glasses [I.?Bakonyi, J. Magn. Magn. Mater. 324, 3961 (2012)].
 
报告人简介
Dr. Imre Bakonyi received his Ph.D. (1976) from the E?tv?s University in Budapest, Hungary, his C.Sc. (1991) and D.Sc. (2007) degrees from the
Hungarian Academy of Sciences (HAS). He served as the Head of Metals Research Department at the Wigner Research Centre for Physics of HAS
from 1995 to 2012. In 2016, he was appointed to a research professor emeritus status by HAS. Dr. Bakonyi has received the Zoltan Gyulai Award of
the E?tv?s Physical Society of Hungary, and thre times the Annual Publication Award of his institue. Dr. Bakonyi has a total of more than 200 research
papers in English, 1 patent, 2 book chapters, and about 2,600 independent citations to published papers; his research expertise is in the preparation,
thermal stability, atomic and electronic structure, electrical transport and magnetic properties of amorphous, nanocrystalline, multilayered and other
metastable metallic phases, metal hydrides. His current focus of research is the giant magnetoresistance (GMR) in electrodeposited multilayers and
multilayered nanowires.