Challenges for voltage-driven spintronics ~Voltage-controlled magnetic anisotropy~

Abstract: Spintronics is expected to realize novel electronic devices with ultra-low stand-by power by utilizing non-volatility of magnetism. However, one of crucial technical challenges is the reduction of operation power because the present electric-current based spin manipulation consumes high energy due to Ohmic dissipation. To overcome this fundamental obstacle, development of electric-field control of spin is drawing much attention. Among several kinds of approaches for electric-field control of spin, voltage-controlled magnetic anisotropy (VCMA) in an ultrathin 3d transition ferromagnetic metal layer is a promising approach. The great advantage of the VCMA effect is that it can be applied in an MgO-based magnetic tunnel junction (MTJ) with high-speed responsiveness. However, for the development of voltage-torque magnetic random access memory, we need to show the scalability with low writing error rate (WER).

In the presentation, recent progresses in systematic materials researches for the improvement of perpendicular magnetic anisotropy (PMA) and VCMA effect in Fe alloy/MgO MTJs and the demonstration of voltage-induced dynamic magnetization switching will be introduced with future prospects and challenges.

Biography: Dr. Takayuki Nozaki received his Ph.D. in engineering from the Tohoku University, Japan, in 2006. From 2007 to 2011, he worked as an assistant professor at Prof. Yoshishige Suzuki’s group in Osaka University and started the study on voltage-controlled magnetic anisotropy (VCMA) effect in all solid devices. During this period, he firstly demonstrated the VCMA effect in MgO-based magnetic tunnel junction and voltage-induced high-speed spin dynamics. In 2012, he moved to the spintronics research center of National Institute of Advanced Industrial Science and Technology and is now working as a team leader of voltage-driven spintronics team and also as a principal investigator of ImPACT program for “Achieving ultimate Green IT Devices with long usage times without charging” using VCMA effect.

For more information, contact Prof. K. Wang ()

Date(s) - Dec 08, 2016
2:00 pm - 3:00 pm

E-IV Maxwell Room #57-124
420 Westwood Plaza - 5th Flr. , Los Angeles CA 90095