鐵電基底上CoFe和CoNi薄膜磁特性的電場調控研究
[Abstract]:With the development of information technology, people rely more and more on information, and also put forward higher requirements for information storage devices. At present, magnetic information storage devices, which are widely used by people, use current to produce magnetic field to change the magnetization state to write information, which has the disadvantage of high power consumption. Therefore, it is an urgent requirement in the field of magnetic information storage to find a new faster, more efficient and less energy consuming way to write information. In this paper, we study the effect of electric field in ferroelectric / ferromagnetic structure on the magnetization state of magnetic thin films. This new control method has the advantages of less heat loss, less space needed, and the voltage can be applied at a fixed point. In the future magnetic information storage devices have a good application prospects. CoFe and CoNi thin films, which are widely used in magnetoresistance study, are selected as materials. The main contents are as follows: 1) the effects of electric field on the magnetic properties of CoFe thin films on (1-x) [Pb (Mg11/3Nb2/303)] -x [PbTi03] (PMN-30%PT) ferroelectric substrates are studied. Due to the large piezoelectric coefficient of PMN-30%PT and the excellent soft magnetism and magnetostrictive coefficient of CoFe thin film, the anisotropic field of CoFe film under the action of 12kV/cm electric field reaches 1.2 KOe, which corresponds to the 90 擄rotation of the magnetoelectric coupling coefficient of 100Oe cm/kV, CoFe film. The in plane magnetization direction is interchangeable. 2) the effect of electric field on the superparamagnetic FeCo-SiO2 granular film on PMN-30%PT substrate is studied. In the structure of CoFe-SiO2, when the content of Si02 is 45%, CoFe exhibits excellent superparamagnetism. PMN-30%PT produces in-plane anisotropic strain under the action of electric field. The CoFe magnetic moment is arranged along the strain elongation direction, and the CoFe film changes from superparamagnetic nanocrystalline film to uniaxial anisotropic single-domain granular film. 3) the composition of CoNi film has great influence on the magnetic properties and magnetoresistance. The effect of electric field on the magnetic properties of CO43N157 and CO23Ni77 thin films on ferroelectric substrates PMN-30%PT and PMN-32%PT has been studied in this paper. In Co23Ni77/PMN-32%PT structure, the anisotropy field and magnetoelectric coupling coefficient of CO43N157 and CO23Ni77 thin films are up to 4000eand 40Oecm / kV respectively. Because the magnetostrictive coefficient of CoNi thin film is opposite to that of CoFe, the effect of electric field on the magnetic moment of CoNi and CoFe is opposite. In the structure of PMN-PT/ (CoFe/Cu/CoNi) n multilayer film, the magnetic moment of CoFe and CoNi can be changed from parallel state to vertical state by applying applied voltage, and the corresponding film changes from low resistance state to high resistance state. This effect can be applied to write / read information memory. 4) the regulation effect of electric field on magnetic layer in ferroelectric / ferromagnetic structure is closely related to the strain characteristics of ferroelectric layer. PMN-30%PT single crystal material, The in-plane linear strain caused by electric field is larger than that of nonlinear strain, and the magnetic change based on strain regulation shows a volatile Butterfly shape, while for PMN-32%PT single crystal material, the linear strain is larger than the nonlinear strain. Due to the large residual strain effect due to the reversal of 71 擄and 109 擄polarization directions in the polarization process, the magnetic moment of the CoNi film exhibits a non-volatile Loop shape with the change of the electric field. This non-volatile regulation is very important for the realization of electric field writing information memory devices.
【學位授予單位】:蘭州大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TB383.2
【共引文獻】
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