Magnetoimpedance of NiFe/Ag multilayers in the 100kHz–1.8GHz range

Andrade, Ankilma do Nascimento; Silva, R.B. da; Corrêa, M.A.; Viegas, A.D.C.; Severino, Andrea; Sommer, R.L.

doi:10.1016/j.jmmm.2003.12.826

Cited by 14 publications

(8 citation statements)

References 3 publications

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“…Compared to wires and ribbons, the results obtained with thin film sensors have not been as good, and the highest GMI ratios reported are around 250% [42]. This may be due to the differences in the magnetic softness as well as the magnetic anisotropy, which is very well established in circumferential and transversal direction in wires and ribbons, respectively, and is difficult to control in thin films.…”

Section: Thin Film Gmi Sensorsmentioning

confidence: 96%

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Surface Acoustic Wave Based Magnetic Sensors

Rowais¹,

Kosel²

2013

Modeling and Measurement Methods for Acoustic Waves and for Acoustic Microdevices

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Section: Thin Film Gmi Sensorsmentioning

confidence: 96%

“…Therefore, a lot of effort has been put into improving the magnetic properties of GMI materials [41][42][43][44]. At the same time, GMI sensors of different structures have been developed such as glass-coated wires, thin films, multi layer thin films, meander structures, ribbons, etc.…”

Section: Basics Of Gmi Sensorsmentioning

confidence: 99%

Surface Acoustic Wave Based Magnetic Sensors

Rowais¹,

Kosel²

2013

Modeling and Measurement Methods for Acoustic Waves and for Acoustic Microdevices

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“…However, it is not possible to obtain magnetically-soft permalloy films of this thickness because of the existence of the transition to a “transcritical” state [ 19 , 20 , 21 ]. A technological solution of this problem, the nanostructuring of ferromagnetic layers, was proposed and successfully demonstrated by different groups [ 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Permalloy-Based Thin Film Structures: Magnetic Properties and the Giant Magnetoimpedance Effect in the Temperature Range Important for Biomedical Applications

Членова

Moiseev

Derevyanko

et al. 2017

Sensors

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Permalloy-based thin film structures are excellent materials for sensor applications. Temperature dependencies of the magnetic properties and giant magneto-impedance (GMI) were studied for Fe19Ni81-based multilayered structures obtained by the ion-plasma sputtering technique. Selected temperature interval of 25 °C to 50 °C corresponds to the temperature range of functionality of many devices, including magnetic biosensors. A (Cu/FeNi)5/Cu/(Cu/FeNi)5 multilayered structure with well-defined traverse magnetic anisotropy showed an increase in the GMI ratio for the total impedance and its real part with temperature increased. The maximum of the GMI of the total impedance ratio ΔZ/Z = 56% was observed at a frequency of 80 MHz, with a sensitivity of 18%/Oe, and the maximum GMI of the real part ΔR/R = 170% at a frequency of 10 MHz, with a sensitivity of 46%/Oe. As the magnetization and direct current electrical resistance vary very little with the temperature, the most probable mechanism of the unexpected increase of the GMI sensitivity is the stress relaxation mechanism associated with magnetoelastic anisotropy.

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“…Particularly, sensors based on the giant magnetoimpedance (GMI) effect have provided a much better alternative because of its high sensitivity, stability and small size. Much effort has been made to investigate the influence of sample structure, such as multilayer [1][2][3][4][5][6][7][8][9] and meandered structure [10][11][12][13][14] of thin films and ribbons, on GMI effect in soft magnetic material. These results suggest that except for the choosing of different materials (wire, thin film and ribbon) and the optimizing treatment (annealing, doping, etc.)…”

Section: Introductionmentioning

confidence: 99%