Modulation Of Giant Magnetoimpedance Effect Of FINEMET Ribbons By CoFeSiB And IGZO Films

In recent years,with the development of science and technology,magnetic sensors have become an important part of the sensor industry.Based on the advantages of high sensitivity,high response speed and low power consumption,the giant magneto-impedance effect not only has important application value in the field of sensors,but also can be used as a means to study magnetic interactions.Therefore,the research on the optimization of the GMI effect of materials has aroused the strong research interest of researchers.At present,researchers have conducted in-depth research on the GMI effect of conductors and magnetic materials and magnetic materials to form composite structural materials.However,there are few reports on the modulation of the GMI effect by semiconductors,and the use of GMI to study the interaction between magnetic materials remains to be further explored.Therefore,in this paper,composite ribbons with different film structures were prepared by magnetron sputtering,and the magnetic properties and GMI effect of the composite ribbons were analyzed.The result is as follows:(1)Using magnetron sputtering method,CoFeSiB magnetic layers were deposited on the smooth side,rough side and both sides of FINEMET ribbon to obtain FINEMET/CoFeSiB,CoFeSiB/FINEMET and CoFeSiB/FINEMET/C oFeSiB composite ribbons.The maximum GMI ratios of the three composite ribbons were 65%,53%,and 81%,respectively.Compared with the FINEMET ribbon,the maximum GMI ratios of the composite ribbons were increased by 31%,19%,and 47%,respectively.It shows that a certain thickness of CoFeSiB film is beneficial to improve the GMI effect of FINEMET ribbon.The variation of the peak field (?)p^CoFeSiB in the FINEMET/CoFeSiB and CoFeSiB/FINEMET/CoFeSiB composite ribbons were 2.4 Oe?0.8 Oe and 3.6 Oe?1.6 Oe,respectively.And the peak field (?)p^CoFeSiB in the FINEMET/CoFeSiB composite ribbons is much smaller than that in the CoFeSiB/FINEMET/CoFeSiB composite ribbons.The main reason is that in the CoFeSiB/FINEMET/CoFeSiB composite ribbons,the CoFeSiB films on the upper and lower surfaces will generate a dipole field on the upper surface of the FINEMET ribbon,while in the FINEMET/CoFeSiB composite ribbons,only a single-layer CoFeSiB film generates a dipole field on the upper surface of the FINEMET ribbon.Therefore,The peak field of CoFeSiB/FINEMET/CoFeSiB composite ribbons is larger than that of the FINEMET/CoFeSiB composite ribbons.(2)The semiconductor thin film IGZO was deposited on the FINEMET ribbon to obtain the FINEMET/IGZO composite ribbons.When the thickness of the IGZO film is 150 nm,its GMI ratio reaches the maximum value(45%),which is improved by 11%relative to the FINEMET ribbon.In order to study the magnetic dipole interaction between the magnetic layer and the FINEMET ribbon,IGZO films with different thicknesses were deposited between the FINEMET ribbon and CoFeSiB thin films to obtain FINEMET/IGZO/CoFeSiB composite ribbons,its maximum GMI ratio reaches 58%,which is 13%higher than that of FINEMET/IGZO composite ribbons.Due to the presence of the non-magnetic layer IGZO between the CoFeSiB film and the FINEMET ribbon,there is only a magnetic dipole interaction between the CoFeSiB film and the FINEMET ribbon.As the thickness of the IGZO film increases,the peak field (?)p^CoFeSiB decreases from 2.4 Oe to 0.2 Oe.This change reflects the change of the dipole field (?)(dip)^CoFeSiB produced by the CoFeSiB film to the FINEMET ribbon,indicating that its dipole interaction is also gradually weakened,which is consistent with the theoretical formula.The research in this paper not only provides help for the theoretical study of GMI effect,but also provides a theoretical basis for the design and application of magneto-sensitive sensors based on GMI effect.