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Exchange-coupled fct-FePd/α-Fe nanocomposite magnets converted from Pd/Fe3O4 core/shell nanoparticles

หน่วยงาน Nanyang Technological University, Singapore

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ชื่อเรื่อง : Exchange-coupled fct-FePd/α-Fe nanocomposite magnets converted from Pd/Fe3O4 core/shell nanoparticles
นักวิจัย : Liu, Fei , Dong, Yunhe , Yang, Wenlong , Yu, Jing , Xu, Zhichuan , Hou, Yanglong
คำค้น : DRNTU::Science::Chemistry
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2557
อ้างอิง : Liu, F., Dong, Y., Yang, W., Yu, J., Xu, Z., & Hou, Y. (2014). Exchange-coupled fct-FePd/α-Fe nanocomposite magnets converted from Pd/Fe3O4 core/shell nanoparticles. Chemistry -A European journal, 20(46), 15197-15202. , 0947-6539 , http://hdl.handle.net/10220/24570 , http://dx.doi.org/10.1002/chem.201403787
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Chemistry - A European journal
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

We report the controlled synthesis of exchange-coupled face-centered tetragonal (fct) FePd/α-Fe nanocomposite magnets with variable Fe concentration. The composite was converted from Pd/Fe3O4 core/shell nanoparticles through a high-temperature annealing process in a reducing atmosphere. The shell thickness of core/shell Pd/Fe3O4 nanoparticles could be readily tuned, and subsequently the concentration of Fe in nanocomposite magnets was controlled. Upon annealing reduction, the hard magnetic fct-FePd phase was formed by the interdiffusion between reduced α-Fe and face-centered cubic (fcc) Pd, whereas the excessive α-Fe remained around the fct-FePd grains, realizing exchange coupling between the soft magnetic α-Fe and hard magnetic fct-FePd phases. Magnetic measurements showed variation in the magnetic properties of the nanocomposite magnets with different compositions, indicating distinct exchange coupling at the interfaces. The coercivity of the exchange-coupled nanocomposites could be tuned from 0.7 to 2.8 kOe and the saturation magnetization could be controlled from 93 to 160 emu g−1. This work provides a bottom-up approach using exchange-coupled nanocomposites for engineering advanced permanent magnets with controllable magnetic properties.

บรรณานุกรม :
Liu, Fei , Dong, Yunhe , Yang, Wenlong , Yu, Jing , Xu, Zhichuan , Hou, Yanglong . (2557). Exchange-coupled fct-FePd/α-Fe nanocomposite magnets converted from Pd/Fe3O4 core/shell nanoparticles.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Liu, Fei , Dong, Yunhe , Yang, Wenlong , Yu, Jing , Xu, Zhichuan , Hou, Yanglong . 2557. "Exchange-coupled fct-FePd/α-Fe nanocomposite magnets converted from Pd/Fe3O4 core/shell nanoparticles".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Liu, Fei , Dong, Yunhe , Yang, Wenlong , Yu, Jing , Xu, Zhichuan , Hou, Yanglong . "Exchange-coupled fct-FePd/α-Fe nanocomposite magnets converted from Pd/Fe3O4 core/shell nanoparticles."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2557. Print.
Liu, Fei , Dong, Yunhe , Yang, Wenlong , Yu, Jing , Xu, Zhichuan , Hou, Yanglong . Exchange-coupled fct-FePd/α-Fe nanocomposite magnets converted from Pd/Fe3O4 core/shell nanoparticles. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2557.