日本金属学会九州支部・日本鉄鋼協会九州支部

第 321 回材料科学談話会
九州大学超顕微解析研究センター、微細構造解析プラットフォーム「ナノマテリアル開発のための超顕微解析共用拠点」共催

第 209 回ＨＶＥＭ研究会のお知らせ
平成２８年７月 5 日

Univ. of Washington の Krishnan 先生をお招きし、磁性微粒子に関する研究をご紹介いただきます。皆様、奮ってご参加下さい。

【日時】平成２８年７月２０日（水）【会場】九州大学

伊都キャンパス

１３時３０分 ～ １４時３０分

超顕微解析研究センター(CE21 棟)セミナー室（〒810-0395 福岡県福岡市西区元岡７４４番地）【講演】

Kannan M. Krishnan

Professor, University of Washington, Seattle, USA

Nanomagnetism: From materials to medicine and information*********************************************************************

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材料科学談話会世話人：波多 聰
ＨＶＥＭ研究会世話人：安田和弘・佐藤幸生・波多 聰
連絡先：村上恭和（九州大学 大学院工学研究院 エネルギー量子工学部門）
E-mail: murakami@nucl.kyushu-u.ac.jp

Kyushu, Japan, July 19/20, 2016

Nanomagnetism: From materials to medicine and information
Kannan M. Krishnan
Department of Materials Sciences & Engineering and Physics
University of Washington, Seattle, USA
kannanmk@uw.edu
http://depts.washington.edu/kkgroup/

Abstract
There has been a renaissance in magnetism and magnetic materials research on the nanometer
length scale, largely driven by size-dependent scaling laws, exchange, proximity and interface effects,
advances in chemical synthesis1 and lithographic fabrication2,3, and their demonstrated impact ininformation4 and biomedical5 technologies.
I will begin this lecture with a brief discussion of criteria that define Nanoscience andNanotechnology and illustrate them with characteristic length scales and size effects that make magnetism
ideal, not only for fundamental investigations, but also technological and biomedical developments on
this length scale. I will then discuss bottom-up chemical synthesis of magnetic nanoparticles, followed bytheir self-assembly6, and inter-particle magnetic interactions/order7 studied by electron holography.
In the second part of this lecture, I will show that recent developments in the synthesis8 andapplications3 of highly monodisperse and phase-pure magnetite nanoparticles, with negligible toxicity9and favorable biodistribution10, allows for reproducible control of their magnetic relaxation5, even in“harsh” biological environments, enabling a novel, tracer-based, whole-body imaging technique with noionizing radiation, called Magnetic Particle Imaging (MPI) 11,12,13. I will discuss the unique physics of
MPI and present recent results in phantom and in vivo imaging of animal models for cardiovasculardisease and molecular imaging of cancer.
In the final part of the talk, I will address the current status of magnetic information storage anddiscuss the development of next-generation bit-patterned media4, based on large area nanoimprint
lithography, proposed to sustain the current growth rate of recording densities. If time permits, I willconclude with a discussion of a novel concept of building Boolean logic gates14, called magnetic quantum
cellular automata, based purely on dipolar coupling of e-beam lithography fabricated nanoscale magneticarrays15.

1

V. F. Puntes, Kannan M. Krishnan and P.A. Alivisatos, Science, 291, 2115-2117 (2001).
Wei Zhang and Kannan M. Krishnan, Jour. Micromech. & Microeng. 24, 093001 (2014)
3
Y. Bao, T. Wen, A.C. Samia, A.P. Khandhar, and Kannan M. Krishnan, Jour Mater. Sci. , 51, 513-553 (2016)
4Zheng Li, Wei Zhang and Kannan M. Krishnan, AIP Advances. 5, 087165 (2015)
5Kannan M. Krishnan, IEEE Trans. Mag. 46, 2523-2558 (2010)
6
Y. Bao, M. Beerman and Kannan M. Krishnan, Jour. of Mag. Mag. Mat., 272-276, Supp1, E1367-E1368 (2004)
7
Y. Gao, Y. Bao, A. B. Pakhomov, Daisuke Shindo and Kannan M. Krishnan, Phys. Rev. Lett., 96, 137205 (2006)
2

8

R. Hufschmid et al Nanoscale, 7, 11142 (2015)
H. Arami, A. Khandhar, D. Liggitt and Kannan M. Krishnan, Chem. Soc. Rev. 44, 8576 (2015)10
H. Arami, A. P. Khandhar, A. Tomitaka and Kannan M. Krishnan, Biomaterials 52, 251 (2015)11
B. Gleich & J. Weizenecker, Nature 435, 1214 (2005).
12
R.M. Ferguson, et al, IEEE Trans. Med. Imag. 34, 1077 (2015)13
A. Tomitaka, S. Gandhi, H. Arami and Kannan M. Krishnan, Nanoscale 7, 16890-16898 (2015).
14
Zheng Li and Kannan M. Krishnan, “Misalignment-free signal propagation in nanomagnet arrays and logic gateswith 45°-clocking field”, Jour. Appl. Phys. 115, 17E502 (2014)15
This work was supported by US-NIH Grants 1RO1EB013689-01/NIBIB, 1R41EB013520-01, and2R42EB013520-02A1; US-DOE/BES Grant ER45987 and US-NSF Grant DMR-1063489
9

Kyushu, Japan, July 19/20, 2016

PROF. KANNAN M. KRISHNAN
Departments of Materials Sciences & Physics
University of Washington, Seattle, USA
http://faculty.washington.edu/kannanmk
http://depts.washington.edu/kkgroup/Kannan M. Krishnan (Ph.D. 1984, UC, Berkeley) is Professor of Materials Sciences & Physics at theUniversity of Washington, Seattle. His research interests are in Bioengineering at theintersection of Magnetism, Materials and Medicine, and in Condensed Matter Physics &Materials Engineering to develop paradigms for materials and devices in information and energy
technologies. His recognitions include the Alexander von Humboldt Career Research Award(2016), IEEE Fink Prize (2012) and IEEE Distinguished Lecturer Award (2009), Guggenheim (2004)
and Rockefeller (2008) Fellowships, the Burton Medal (MSA,1992), and the College of Engineering
Outstanding Educator Award (UW, 2004), He is an elected member of the Washington State
Academy of Sciences, and Fellow of the American Association for the Advancement of Science,
the American Physical Society, the Institute of Physics (London), and the Institute of Electricaland Electronics Engineers. In 2010, he founded a start-up company, LodeSpin Labs LLC,
presently developing tailored magnetic carriers for a range of biomedical applications.

九州大学へのアクセスマップ。会場は伊都キャンパスにあります。

伊都キャンパスマップ。会場の建物は#40(超顕微解析研究センター：CE21 棟)です。