Optimizing the Magnetic Properties of Cascaded Spin Valve Ellipses for Magnetic Field Sensors

2016 ◽  
Author(s):  
Y. C. Su ◽  
K. W. Lee ◽  
Y. C. Lee ◽  
V. S. Luong ◽  
J. H. Hsu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Spin Valve ◽  
Magnetic Field Sensors

Flat Bandwidth Expansion for Spin-Valve GMR Magnetic Field Sensors

2018 ◽  
Vol 54 (11) ◽  
pp. 1-4 ◽  
Author(s):  
Yi-Shian Chiang ◽  
Xuan Thang Trinh ◽  
Jen-Tzong Jeng
Keyword(s):  
Magnetic Field ◽  
Spin Valve ◽  
Magnetic Field Sensors ◽  
Bandwidth Expansion

scholarly journals Clusters of Spin Valve Sensors in 3D Magnetic Field of a Label

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3595
Author(s):  
Georgy V. Babaytsev ◽  
Nikolay G. Chechenin ◽  
Irina O. Dzhun ◽  
Mikhail G. Kozin ◽  
Alexey V. Makunin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Optimal Design ◽  
Giant Magnetoresistance ◽  
Spin Valve ◽  
Inhomogeneous Magnetic Field ◽  
Magnetic Field Sensors ◽  
Cluster Networks ◽  
Specific Shape ◽  
Gmr Sensors ◽  
Positioning Devices

Magnetic field sensors based on the giant magnetoresistance (GMR) effect have a number of practical current and future applications. We report on a modeling of the magnetoresistive response of moving spin-valve (SV) GMR sensors combined in certain cluster networks to an inhomogeneous magnetic field of a label. We predicted a large variety of sensor responses dependent on the number of sensors in the cluster, their types of interconnections, the orientation of the cluster, and the trajectory of sensor motion relative to the label. The model included a specific shape of the label, producing an inhomogeneous magnetic field. The results can be used for the optimal design of positioning devices.

scholarly journals Possibile Applications of Magnetic Microwires in Aviation

2014 ◽  
Vol 2013 (5) ◽  
pp. 12-17
Author(s):  
Katarína Draganová ◽  
Josef Blažek ◽  
Dušan Praslička ◽  
František Kmec
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Tensile Stress ◽  
Temperature Sensors ◽  
Sensing Element ◽  
Magnetic Field Sensors ◽  
Magnetic Microwires ◽  
Stress Sensors ◽  
Wide Range ◽  
Potential Applications

Abstract Magnetic microwires have been rediscovered due to a number of the unusual magnetic properties and their potential applications. The paper concerns glass-coated magnetic microwires composed of a ferromagnetic metallic core with a diameter of 0.6 - 30 jj.m and of a glass coat with a thickness of 2 - 20 jj.m. The fabrication process and magnetic properties of these microwires are described. Due to their unique properties microwires can be used as a sensing element of sensors. Microwire-based sensors can be used in a wide range of aviation applications as magnetic field sensors, tensile stress sensors or temperature sensors. The main advantages of microwire-based sensors are associated with their small dimensions and weight, which play a very important role in aviation.

scholarly journals Synthesis of bulk crystals and thin films of the ferromagnetic MnSb

2021 ◽  
Vol 23 (3) ◽  
pp. 387-395
Author(s):  
Muhammadyusuf Jaloliddinzoda ◽  
Sergey F. Marenkin ◽  
Alexey I. Ril’ ◽  
Mikhail G. Vasil’ev ◽  
Alexander D. Izotov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Curie Point ◽  
High Vacuum ◽  
Microstructural Analysis ◽  
Stoichiometric Composition ◽  
Deposition Process ◽  
Endothermic Effect ◽  
Magnetic Memory ◽  
Magnetic Field Sensors

High-temperature ferromagnets are widely used on a practical level. Based on them, magnetic memory for computers and various types of magnetic field sensors are created. Therefore, bulk ingots and thin-film samples of ferromagnet manganese antimonide (MnSb) with a high Curie point are of great interest, both from the practical and fundamental sides. Manganese antimonide films are obtained in hybrid structures using molecular-beam epitaxy. The thickness of the films does not exceed tens of nanometers. Despite their high sensitivity to magnetic fields, their small thickness prevents them from being used as magnetic field sensors. The aim of this work was to synthesise thick bulk ingots of manganese antimonide crystalsand films with a thickness of ~ 400 nm on sitall and silicon substrates. MnSb crystals were synthesised using the vacuum-ampoule method and identified using XRD, DTA, and microstructural analysis. The results of studies of bulk samples indicated the presence of an insignificant amount of antimony in additionto the MnSb phase. According to the DTA thermogram of the MnSb alloy, a small endothermic effect was observed at 572 °C, which corresponds to the melting of the eutectic on the part of antimony in the Mn-Sb system. Such composition, according to previous studies, guaranteed the production of manganese antimonide with the maximum Curie temperature. A study of the magnetic properties showed that the synthesised MnSb crystals were a soft ferromagnet with the Curie point ~ 587 K. Thin MnSb films were obtained by an original method using separate sequential deposition in a high vacuum of the Mnand Sb metals with their subsequent annealing. To optimise the process of obtaining films with stoichiometric composition, the dependences of the thickness of metal films on the parameters of the deposition process were calculated. The temperature range of annealing at which the metals interact with the formation of ferromagnetic MnSb films was established, the films were identified, and their electrical and magnetic properties were measured 

Monolithic Integration of 2D Spin Valve Magnetic Field Sensors for Angular Sensing

2015 ◽  
Vol 2 (8) ◽  
pp. 4206-4211 ◽  
Author(s):  
M.J. Almeida ◽  
T. Götze ◽  
O. Ueberschär ◽  
P. Matthes ◽  
M. Müller ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spin Valve ◽  
Monolithic Integration ◽  
Magnetic Field Sensors

Giant Magnetoresistance Studies of NiFe-Based Spin-Valve Multilayers

1994 ◽  
Vol 343 ◽  
Author(s):  
Chien-Li Lin ◽  
John M. Sivertsen ◽  
Jack H. Judy
Keyword(s):  
Magnetic Field ◽  
Thermal Stability ◽  
Magnetic Properties ◽  
Multilayer Structure ◽  
Giant Magnetoresistance ◽  
Room Temperature ◽  
Spin Valve ◽  
Vibrating Sample Magnetometer ◽  
Recording Head ◽  
Annealing Experiments

ABSTRACTThe giant magnetoresistance in FeMn exchange-biased NiFe-based multilayer spin-valve structures prepared by rf-diode sputtering technique were studied. Experiments were performed on samples with different thicknesses of each layer in these multilayers. The magnetic properties were measured using a vibrating sample magnetometer and the giant magnetoresistance was measured using an in-line four-point magnetoresistance probe. A magnetoresistance of 6.5% in a magnetic field of less than 15 Oe was obtained in a Cu(30Å)/FeMn(150Å)/NiFe(50Å)/Co(15Å)/ Cu(20Å)/Co(15Å)/NiFe(60Å) multilayer structure at room temperature. Annealing experiments of these multilayers were performed to study the thermal stability during the recording head fabrication processes. No degradation in the magnetoresistance has been found for annealing these films at 230°C up to four hours.

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