A torque magnetometer for thin films applications

Rigue, Josué Neroti; Chrischon, Dieivase; Andrade, Ankilma do Nascimento; Carara, M.

doi:10.1016/j.jmmm.2011.12.002

Cited by 24 publications

(11 citation statements)

References 15 publications

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“…This finally leads to the amplitude fluctuations of flux Φ 1 and (2) the main magnetic flux in the magnetic circuit is composed by Φ 1 and Φ sq , as shown in Fig. 4, and Φ sq is changed with the load torque T according to formula (7), so the axis of the main magnetic flux deviated from the center of the original position and its amplitude is changed with the load torque T.…”

Section: Sensor Load Effect and Compensating Methodsmentioning

confidence: 99%

“…With the rapid development of science and technology, the torque measurement technology developed rapidly and it has obtained widespread application in the automotive technology, robotics, diesel, oil, agricultural machinery, shipping, transportation, metallurgy, and other aspects. [1][2][3][4][5][6][7] In recent years, many experts have conducted a series of research investigations dealing with torque measurement, and a variety of new torque measuring devices have been designed. Liu proposed a non-elastic piezoelectric six-axis force sensor 8 in which the operating principle of the piezoelectric six-axis force sensor was analyzed, and a structural model was constructed; Kim proposed a new type of noncontacting torque sensor based on the mechanoluminescence of a new microparticle, 9 which is intended to address the mechanoluminescence intensity decay present in a previous torque measurement system prototype with conventional microparticles.…”

Section: Introductionmentioning

confidence: 99%

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A differential electromagnetic induction torque sensor and its finite element analysis

Zhao

2015

Review of Scientific Instruments

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Torque is an important parameter for condition monitoring and fault diagnosis for rotary machines. This paper describes a new structure differential torque sensor based on the principle of electromagnetic induction. The method involves the construction of a pulsating flux by the excitation winding of the sensor, and the torsion angle produced by the load torque is converted into the angle displacements of the excitation winding and the output winding. Last, the output winding of sensor generates an induction potential force, which is proportional to the load torque as seen through electromagnetic coupling. Sensor sensitivity would be reduced by load effect; therefore, this paper presents a suppression method that can ensure the sensitivity is not affected. The transfer function of the sensor is constructed through Laplace transformation. The sensor characteristics are simulated by finite elements, including the influence of winding coil numbers and excitation voltage frequency. The sensor was calibrated by a torsion testing machine, and the experimental results indicated that the sensitivity of the sensor is about 18.2 mV/Nm, the non-repeatability error is about 2.3%, the non-linear error is about 3.3%, and the hysteresis error is about 2.6%.

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Section: Sensor Load Effect and Compensating Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A differential electromagnetic induction torque sensor and its finite element analysis

Zhao

2015

Review of Scientific Instruments

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“…Cantilever torque magnetometry (CTM) [12] takes advantage of the small stiffness of AFM cantilevers to detect very small torques. The magnetization sensitivity of CTM is comparable to superconducting quantum interference device magnetometry [13] over a broad temperature range [14][15][16]. An important advantage of torque magnetometry is its relatively fast response which allows for the investigation of dynamic phenomena in magnets and high-T c superconductors [15,17].…”

Section: Introductionmentioning

confidence: 99%

Theoretical model for torque differential magnetometry of single-domain magnets

et al. 2014

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We present a generic theoretical model for torque differential magnetometry (TDM)-an experimental method for determining the magnetic properties of a magnetic specimen by recording the resonance frequency of a mechanical oscillator, on which the magnetic specimen has been mounted, as a function of the applied magnetic field. The effective stiffness change, and hence the resonance frequency shift, of the oscillator due to the magnetic torque on the specimen is calculated, treating the magnetic specimen as a single magnetic domain. Our model can deal with an arbitrary magnetic free-energy density characterizing the specimen, as well as any relative orientation of the applied magnetic field, the specimen, and the oscillator. Our calculations agree well with published experimental data. The theoretical model presented here allows one to take full advantage of TDM as an efficient magnetometry method.

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“…Mechanical measurements of magnetic torque fundamentally probe combinations of net magnetic moment and magnetic susceptibility anisotropy [1]. Thin-film structures dominate the applications of micro-and nanomechanical torque measurements [2]. In most applications to magnetometry of thin-film magnetic structures [3,4], the net moment contribution dominates, owing to large shape anisotropy inhibiting magnetizability out-of-plane.…”

Section: Introductionmentioning

confidence: 99%

Two-axis cavity optomechanical torque characterization of magnetic microstructures

et al. 2019

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Significant new functionality is reported for torsion mechanical tools aimed at full magnetic characterizations of both spin statics and dynamics in micro-and nanostructures. Specifically, two orthogonal torque directions are monitored and the results co-analyzed to separate magnetic moment and magnetic susceptibility contributions to torque, as is desired for characterization of anisotropic three-dimensional structures. The approach is demonstrated through application to shape and microstructural disorder-induced magnetic anisotropies in lithographically patterned permalloy, and will have utility for the determination of important magnetic thin-film and multilayer properties including interface anisotropy and exchange bias. The results reflect remarkable sensitivity of the outof-plane magnetic torque to the nature of small edge domains perpendicular to the applied field direction, and also contain tantalizing indications of direct coupling to spin dynamics at the frequency of the mechanics.

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A torque magnetometer for thin films applications

Cited by 24 publications

References 15 publications

A differential electromagnetic induction torque sensor and its finite element analysis

A differential electromagnetic induction torque sensor and its finite element analysis

Theoretical model for torque differential magnetometry of single-domain magnets

Two-axis cavity optomechanical torque characterization of magnetic microstructures

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