Researching progress of the 1/f noise in TMR and GMR sensors

Shao-Bing, Wu; Chen, Shi; Li, Hai; Xiaofei, Yang

doi:10.7498/aps.61.097504

Cited by 8 publications

(3 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thermal–magnetic noise is mainly caused by magnetization fluctuations due to magnetic field and thermal excitation (Yan et al , 2022; Egelhoff et al , 2009). Shot noise arises in discontinuities in the conduction medium as a consequence of the discrete nature of the electrical charge (Klaassen et al , 2003; Almeida et al , 2006; Chaves et al , 2007; Jiang et al , 2004; Liou et al , 2008; Wu et al , 2012; Zhang and Xiao, 2019). It is important to note that shot noise is only present in MTJ sensors because they have a thin insulating barrier layer (Al 2 O 3 or MgO), which is a discontinuous conductive medium.…”

Section: Resultsmentioning

confidence: 99%

Noise measurement and system calibration on magnetoresistive sensors

Dou

Bai

Zhu

et al. 2023

View full text Add to dashboard Cite

Purpose The noise measurement on magnetoresistive (MR) sensors is generally conducted by techniques including single-channel data sampling and fast Fourier transform (FFT) analysis as well as two-channel cross-correlation. The single-channel method is easy to implement and is widely used in the noise measurement on MR sensors, whereas the two-channel method can only eliminate part of the system noise. This study aims to address two key issues affecting measurement accuracy: calibration of the measurement system and the elimination of system noise. Design/methodology/approach The system is calibrated by using a low-noise metal film resistor in that the system noise is eliminated through power spectrum subtraction. Noise measurement and analysis are conducted for both thermal noise and detectivity of magnetic tunnel junction (MTJ) sensor. Findings The thermal noise measurement error is less than 2%. The detectivity of the MTJ sensor reaches 27 pT/Hz1/2 at 2 kHz. Originality/value This study provides a more practical solution for noise measurement and system calibration on MR sensors with a bias voltage and magnetic field.

show abstract

Section: Resultsmentioning

confidence: 99%

Noise measurement and system calibration on magnetoresistive sensors

Dou

Bai

Zhu

et al. 2023

View full text Add to dashboard Cite

show abstract

“…In addition, ac modulation can suppress TMR electrical 1/f noise, which originates from defects and holes in the barrier layer or the barrier layer/ferromagnetic layer interface [8]. and these defects are believed to reduce the asymmetric scattering rate of spin-dependent electron [9]. Ac modulation can suppress noise by 30%, improving the magnetic field resolution and anti-interference ability of TMR.…”

Section: Ac Modulationmentioning

confidence: 99%

A Marine Magnetometer Based on TMR

Zhang

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

TMR (tunneling magnetoresistance) has the characteristics of high sensitivity, large linear range, low power consumption, and easy miniaturization, and has received great attention in the field of miniaturized and high-performance magnetic sensors. Widely used in marine magnetic field detection, earthquake monitoring, industrial control, and other fields. In this paper, A TMR marine magnetometer with AC modulation and magnetic field feedback compensation is proposed, designed, and manufactured, which can be used for the measurement of weak marine magnetic fields. After testing, its measurement range is ±100,000nT, the noise fluctuation level is 0.27nT, and nonlinearity level reaches 0.07%. It works by means of ac modulation and real-time compensation of feedback magnetic field, which greatly reduces magnetic hysteresis and increases the linearity. Compared with the nonlinearity of TMR material (more than 20% within ±1Oe, more than 7% within ±0.3Oe), it has been significantly improved.

show abstract

“…2 PSD of 《My heart will go on》 Fig. 3 PSD of 《Rock On the New Long March》 Take cervical spondylotic radiculopathy for example, the design of music prescription should be taken acoount as follows.Firstly, the music whose PSD have 1/f fluctuation characteristic should be picked up.Secondly, the energy of music must focus on 2Hz and 100Hz because the clinical test show the effect is better on the two frequency points [5].Thirdly, the characteristics of music should be enthusiastic,fast-paced and strong.…”

Section: Fig1 Spectral Characteristic Of 1/f Fluctuationmentioning

confidence: 99%

Design of Music Prescription for Music Electroacupuncture Instrument

Wang

Zhang

2014

AMR

View full text Add to dashboard Cite

As a physical therapy way,music therapy has been widely used. The choice of music is very important during treatment because different music has different curative effect. However, the choice of music often come to depend on people's subjective feeling and the theoretical foundation why the music is chosen is unknown. In this paper, the choice of music,i.e. music prescription,is considered from the following three aspects.Firstly,the power spectral density of the music must satisfy the 1/f fluctuation law.Secondly, the relationship must be ascertained between the frequency of the music and symptoms.Thirdly, melody and rhythm of the music should be choosen for different symptoms. Clinical test show that the scheme in this paper is feasible and the treatment effect is significant.

show abstract

Researching progress of the 1/f noise in TMR and GMR sensors

Cited by 8 publications

References 46 publications

Noise measurement and system calibration on magnetoresistive sensors

Noise measurement and system calibration on magnetoresistive sensors

A Marine Magnetometer Based on TMR

Design of Music Prescription for Music Electroacupuncture Instrument

Contact Info

Product

Resources

About