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• Yoshikawa, H
• Awaga, K
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• Yoshikawa, H
• Awaga, K

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Materials 2010, 3(2), 1244-1268; doi:10.3390/ma3021244

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Magnetic and Optical Properties of Submicron-Size Hollow Spheres

Quan-Lin Ye ^†,* , Hirofumi Yoshikawa and Kunio Awaga*

Research Center for Materials Science & Department of Chemistry, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan ^† Present address: Division of Physics and Applied Physics, School of Physical & Mathematical Sciences, 21 Nanyang Link, Nanyang Technological University, 637371 Singapore

* Authors to whom correspondence should be addressed.

Received: 30 December 2009; in revised form: 2 February 2010 / Accepted: 19 February 2010 / Published: 21 February 2010

(This article belongs to the Special Issue Magnetic Nanoparticles)

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Abstract: Magnetic hollow spheres with a controlled diameter and shell thickness have emerged as an important class of magnetic nanomaterials. The confined hollow geometry and pronouncedly curved surfaces induce unique physical properties different from those of flat thin films and solid counterparts. In this paper, we focus on recent progress on submicron-size spherical hollow magnets (e.g., cobalt- and iron-based materials), and discuss the effects of the hollow shape and the submicron size on magnetic and optical properties.

Keywords: hollow sphere; cobalt and cobalt oxides; iron and iron oxides; antiferromagnet; magnetic hysteresis; domain structure; magnetization relaxation; exchange bias; uncompensated spin; Mie scattering

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