Voltage-controllable magnetic behavior in PZT/NiFe/CoFe nanocomposites
Hong, Nguyen Thi Minh; Thang, Pham Duc; Tiep, Nguyen Huy; Cuong, Le Viet; Duc, Nguyen Huu; Hong, Nguyen Thi Minh; Laboratory for Micro and Nanotechnology, Faculty of Engineering Physics and Nanotechnology, University of Engineering and Technology, Vietnam National Universiy in Hanoi, 144 Xuan Thuy, Cau Giay, Hanoi, Vietnam; Thang, Pham Duc; Laboratory for Micro and Nanotechnology, Faculty of Engineering Physics and Nanotechnology, University of Engineering and Technology, Vietnam National Universiy in Hanoi, 144 Xuan Thuy, Cau Giay, Hanoi, Vietnam; Tiep, Nguyen Huy; Laboratory for Micro and Nanotechnology, Faculty of Engineering Physics and Nanotechnology, University of Engineering and Technology, Vietnam National Universiy in Hanoi, 144 Xuan Thuy, Cau Giay, Hanoi, Vietnam; Cuong, Le Viet; Laboratory for Micro and Nanotechnology, Faculty of Engineering Physics and Nanotechnology, University of Engineering and Technology, Vietnam National Universiy in Hanoi, 144 Xuan Thuy, Cau Giay, Hanoi, Vietnam; Duc, Nguyen Huu; Laboratory for Micro and Nanotechnology, Faculty of Engineering Physics and Nanotechnology, University of Engineering and Technology, Vietnam National Universiy in Hanoi, 144 Xuan Thuy, Cau Giay, Hanoi, Vietnam
Журнал:
Advances in Natural Sciences: Nanoscience and Nanotechnology
Дата:
2011-03-01
Аннотация:
Recently, the electric field induced manipulation of magnetic properties has become one of the most interesting research topics because of its promising applications in magnetoelectronics, such as future logic elements and electric–magnetic memories. In this paper, the NiFe/CoFe ferromagnetic nanostructured thin films were directly deposited on the ferroelectric PZT substrate, which was polarized parallel to the thickness or along the surface. In these samples, the stress originating from the piezoelectric layer is transferred into the magnetostrictive layer, which induces an elastic strain and results in a change in magnetization, thanks to the converse magnetoelectric effect. By analyzing the magnetization of the nanocomposite under a fixed magnetic field up to 5×10<sup>3</sup> Oe at different voltages applied to the ferromagnetic substrate, we can investigate the voltage-controllable magnetization in this composite. The obtained results show that the magnetization of the NiFe/CoFe film changes around 6% at the low voltage of 60 V and up to two times larger at 800 V in an external magnetic field of 50 Oe. The use of voltage also allows the reversible adjustment of the magnetization orientation in ferromagnetic layers.
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