【ご案内】ナノスケール・放射光 合同セミナー（12/7 13:30〜）

[supersor ＠ issp.u-tokyo.ac.jp]

ＶＵＶ・ＳＸ高輝度光源利用者懇談会
会員各位


12月7日、ナノスケール・放射光 合同セミナーを下記のとおり開催いたします。
皆様奮ってご参加下さい。

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　　　　　　　　　　　　記

　　　　　ナノスケール・放射光 合同セミナー

日時：　2010年12月7日（火）　13：30〜14：30

会場：　東京大学物性研究所6階　Ａ614　

題目：　Magnetic nanostructures excited with the STM

講師：　Prof. Wulfhekel （Physikalisches Institut, Karlsruhe Institute of 
Technology (KIT), Karlsruhe, Germany）

要旨:

Magnetic nanostructure are at the heart of modern information technology. 
Classically, the magnetic state is switched by applying magnetic fields.

In our work, we use scanning tunneling microscopy (STM) to investigate 
magnetic nanostructures down to the atomic level. Using STM, not only 
information on the topographic and electronic properties can be obtained but 
also on the spin. In contrast to the conventional use of STM as a high 
resolution imaging tool, the STM can even be used to influence magnetism of 
nanostructures.

The most obvious way to modify the magnetic state is to use the spin of the 
tunneling electrons that interact with the nano-structure via the exchange 
interaction. We demonstrate, that this interaction is non-local in itinerant 
systems and that magnetic excitations in from of magnons can be created, 
their energy and momentum can be measured and information on the local 
magnetic anisotropy of the sample can be gathered.

Less obvious is that also the electric filed in the tunneling junction can 
manipulate the magnetic state via magneto-electric coupling. This effect has 
mainly been observed in complex multiferroic insulators. We demonstrate that 
an even stronger magneto-electric coupling is found at the surface of 
ordinary iron and that with the help of STM, magnetic information can be 
written, stored and read in thin Fe films on the nanometer scale.



世話人：　小森文夫　（物性研究所ナノスケール物性研究部門）　　　　　
　　　　　 　柿崎明人　（物性研究所軌道放射物性研究施設）　


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  Synchrotron Radiation Laboratory
  Institute for Solid State Physics,
  The University of Tokyo
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