Strong magnetic enhancement in self-assembled multiferroic-ferrimagnetic nanostructures

Ying-Jiun Chen; Ying-Hui Hsieh; Sheng-Chieh Liao; Zhiwei Hu; Meng-Jie Huang; Wei-Cheng Kuo; Yi-Ying Chin; Tzeng-Ming Uen; Jenh-Yih Juang; Chih-Huang Lai; Hong-Ji Lin; Chien-Te Chen; Ying-Hao Chu

doi:10.1039/C3NR00104K

Strong magnetic enhancement in self-assembled multiferroic-ferrimagnetic nanostructures†

Ying-Jiun Chen,^a Ying-Hui Hsieh,^b Sheng-Chieh Liao,^c Zhiwei Hu,^de Meng-Jie Huang,^a Wei-Cheng Kuo,^f Yi-Ying Chin,^a Tzeng-Ming Uen,^f Jenh-Yih Juang,^f Chih-Huang Lai,^c Hong-Ji Lin,*^a Chien-Te Chen^a and Ying-Hao Chu*^b

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* Corresponding authors

^a National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
E-mail: hjlin@nsrrc.org.tw

^b Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
E-mail: yhc@nctu.edu.tw

^c Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan

^d Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany

^e Max Planck Institute for Chemical Physics of Solids, Nöthnitzerstrasse 40, D-01187 Dresden, Germany

^f Department of Electrophysics, National Chiao Tung University, Hsinchu 30100, Taiwan

Abstract

In the past decade, self-assembled vertical nano-heterostructures have drawn considerable attention because a high interface-to-volume ratio can be used to tailor or create functionalities. We have systematically investigated the magnetic properties of oxide heterostructures consisting of the CoFe₂O₄ nanopillars embedded in the BiFeO₃ matrix using macroscopic magnetization measurements and element-selective soft X-ray absorption magnetic circular dichroism (XMCD) at the Co- and Fe-L_2,3 edge. The magnetization and XMCD data show that the total ordered magnetic moment of Co²⁺ in CoFe₂O₄–BiFeO₃ nano-heterostructures is strongly enhanced. This study clearly indicates that the high interface-to-volume ratio vertical nanostructure creates a strong ferromagnetic and antiferromagnetic magnetic coupling via an interface. Furthermore, the magnetic coupling can be tuned in the multiferroic-ferrimagnetic self-assembled heterostructures by controlling the spacing between nanopillars.

Nanoscale

Strong magnetic enhancement in self-assembled multiferroic-ferrimagnetic nanostructures†

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Strong magnetic enhancement in self-assembled multiferroic-ferrimagnetic nanostructures

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