The Development of ASIC Type GSR Sensor Driven by GHz Pulse Current.

Yoshinobu Honkura,Shinpei Honkura

doi:10.3390/s20041023

Abstract

The GigaHertz spin rotation (GSR) effect was observed through the excitement of Giga Hertz (GHz) pulse current flowing through amorphous wire. The GSR sensor that was developed provides excellent features that enhanced magnetic sensitivity and sine functional relationship, as well as good linearity, absence of hysteresis, and low noise. Considering the GHz frequency range used for the GSR sensor, we assume that the physical phenomena associated with the operation of the sensor are based on spin reduction and rotation of the magnetization. The proper production technology needed was developed and a micro-sized GSR sensor was produced by directly forming micro coils on the surface of the application-specific integrated circuit (ASIC). Some prototypes of the ASIC type GSR sensor have been produced in consideration of applications such as automotive use, mobile device use, and medical use. Therefore, we can conclude that GSR sensors have great potential to become promising magnetic sensors for many applications.

Highlights

IntroductionMagnetic sensors have been used for the monitoring of various processes and functions in a great number of industries such as data storage, home entertainment, energy harvesting and conversion, informatics, telecommunication, aircraft, aerospace, automobile, electronic surveillance, medicine, biology, etc., over many decades [1,2,3].There are several physical phenomena that allow the measurement of magnetic fields, and most of them are based on the use of different magnetic materials.soft magnetic materials serve as the basic material for a wide scale of different sensors [3].Amorphous and nanocrystalline materials prepared by rapid melt quenching present a number of relevant advantages such as excellent magnetic softness, a fast and inexpensive fabrication process, dimensionality suitable for various sensor applications and in certain cases, biocompatibility [4,5,6].Amorphous and nanocrystalline ferromagnetic wires can exhibit very peculiar properties suitable for magnetic sensor applications, such as giant magnetoimpedance (GMI), or single domain wall propagation [6,7,8]
In this paper we present the studied effects of the GigaHertz spin rotation (GSR) sensor, and its many features associated with the Giga Hertz (GHz) pulse frequency on coil voltage, the relationship between the coil voltage and the external field, and hysteresis and noise properties of application-specific integrated circuit (ASIC) type GSR sensor
The spins existing in the surface at the angular velocity ω (=2πf) and the high speed spin rotation excited by GHz pulse current makes the big coil voltage V (= −∆φ/∆t)

Summary

Introduction

Magnetic sensors have been used for the monitoring of various processes and functions in a great number of industries such as data storage, home entertainment, energy harvesting and conversion, informatics, telecommunication, aircraft, aerospace, automobile, electronic surveillance, medicine, biology, etc., over many decades [1,2,3].There are several physical phenomena that allow the measurement of magnetic fields, and most of them are based on the use of different magnetic materials.soft magnetic materials serve as the basic material for a wide scale of different sensors [3].Amorphous and nanocrystalline materials prepared by rapid melt quenching present a number of relevant advantages such as excellent magnetic softness, a fast and inexpensive fabrication process, dimensionality suitable for various sensor applications and in certain cases, biocompatibility [4,5,6].Amorphous and nanocrystalline ferromagnetic wires can exhibit very peculiar properties suitable for magnetic sensor applications, such as giant magnetoimpedance (GMI), or single domain wall propagation [6,7,8]. Magnetic sensors have been used for the monitoring of various processes and functions in a great number of industries such as data storage, home entertainment, energy harvesting and conversion, informatics, telecommunication, aircraft, aerospace, automobile, electronic surveillance, medicine, biology, etc., over many decades [1,2,3]. Soft magnetic materials serve as the basic material for a wide scale of different sensors [3]. Amorphous and nanocrystalline materials prepared by rapid melt quenching present a number of relevant advantages such as excellent magnetic softness, a fast and inexpensive fabrication process, dimensionality suitable for various sensor applications and in certain cases, biocompatibility [4,5,6]. Amorphous and nanocrystalline ferromagnetic wires can exhibit very peculiar properties suitable for magnetic sensor applications, such as giant magnetoimpedance (GMI), or single domain wall propagation [6,7,8]. The above mentioned GMI was the first reported crystalline magnetic wire [9]

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Results

Conclusion