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November 13-15, 2017 | Las Vegas, USA
14
th
International Conference and Exhibition on
Materials Science and Engineering
RRJOMS | Volume 5 | Issue 7 | November, 2017
High-magnetization oxide spinel ferrite films
Jun Ding
National University of Singapore, Singapore
T
etragonal half-metallic magnets find broad applications in spintronics owing to the optimized magnetization and magnetic
anisotropy. Herein, a low-temperature thermal decomposition method is utilized to grow new stabilized tetragonal ferrite films.
Tetragonal Fe
3
O
4
-based film possesses high saturation magnetizations of ~1 Tesla and tetragonal Co-doped Fe
3
O
4
-based film exhibits
high energy product of ~10.9MGOe with perpendicular magnetocrystalline anisotropy. A combined experimental and first-principles
study reveals that carbon interstitials (C
i
B
) and oxygen vacancies (VO) form C
i
B
-V
O
pairs which stabilize the tetragonal phase and
meanwhile enhancing the magnetization. The high magnetization is attributed to the spin flipping on FeA as a result of the C
i
B
-V
O
-
induced atomic migration and lattice distortion. The novel stabilized tetragonal ferrite films with high and tunable magnetization and
magnetic anisotropy largely extends the applications of half-metallic spinel ferrites and novel energy harvest devices.
Biography
Dr Jun Ding is Professor at Department of Materials Science & Engineering, National University of Singapore. He has been working on functional materials (particularly
magnetic materials) over 25 years. His current research is focusing on additive manufacturing (3D printing) with the emphasis of advanced functional and multi-functional
devices.
msedingj@nus.edu.sgJun Ding, Res. Rev. J Mat. Sci. 2017, 5:7
DOI: 10.4172/2321-6212-C1-011