Self-Assembled Epitaxial Core-Shell Nanocrystals with Tunable Magnetic Anisotropy

Sheng-Chieh Liao; Yong-Lun Chen; Wei-Cheng Kuo; Jeffrey Cheung; Wei-Cheng Wang; Xuan Cheng; Yi-Ying Chin; Yu-Ze Chen; Heng-Jui Liu; Hong-Ji Lin; Chien-Te Chen; Jeng-Yih Juang; Yu-Lun Chueh; Valanoor Nagarajan; Ying-Hao Chu; Chih-Huang Lai

doi:10.1002/smll.201500627

Self-Assembled Epitaxial Core-Shell Nanocrystals with Tunable Magnetic Anisotropy

Small. 2015 Sep 2;11(33):4117-22. doi: 10.1002/smll.201500627. Epub 2015 May 28.

Authors

Affiliations

¹ Department of Materials Science & Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan.
² Department of Materials Science & Engineering, National Chiao Tung University, Hsinchu, 30010, Taiwan.
³ Department of Electrophysics, National Chiao Tung University, Hsinchu, 30010, Taiwan.
⁴ School of Materials Science and Engineering, University of New South Wales, Sydney, 2052, Australia.
⁵ Graduate Program for Science and Technology of Accelerator Light Source, National Chiao Tung University, Hsinchu, 30010, Taiwan.
⁶ National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan.

PMID: 26034015
DOI: 10.1002/smll.201500627

Abstract

Epitaxial core-shell CoO-CoFe2 O4 nanocrystals are fabricated by using pulsed laser deposition with the aid of melted material (Bi2 O3 ) addition and suitable lattice mismatch provided by substrates (SrTiO3 ). Well aligned orientations among nanocrystals and reversible core-shell sequence reveal tunable magnetic anisotropy. The interfacial coupling between core and shell further engineers the nanocrystal functionality.

Keywords: core-shell; epitaxy; interfaces; magnetic anisotropy; nanocrystals; self-assembly.