TEMPERATURE DEPENDENCE OF THE AMORPHOUS SmTbFeCo MAGNETO-OPTICAL FILMS

Lee, Z.Y.; Lu, Zhixing; Qiu, Jing; Wang, K.; Xiong, Rui; Yang, Shuo; Hu, Zhenzhong

doi:10.3379/jmsjmag.22.s2_105

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…In figure 7(a), at 2000 Oe there is no hysteresis in the hysteresis loop, which can be regarded to show the saturation magnetic field of the Ni nanofilm. Therefore, the M-T curve at 2000 Oe is further improved by fitting it to the MF theory [21,22].…”

Section: Experiments and Resultsmentioning

confidence: 99%

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Temperature measurement based on the magneto-optic Kerr effect in Ni nanofilms

Yi¹,

Zhu²,

Hou³

et al. 2022

Meas. Sci. Technol.

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Thermometry is essential in laboratory and industry settings. We propose a noninvasive temperature measurement method based on the superparamagnetic properties of nickel-plated films.When the nickel(Ni) film is uniformly heated from 100K to 300K, we observe that the polarization angle of the reflected polarized light decreases correspondingly. Compared with optical temperature measurement, this method introduces magnetic physical quantity, which increases the penetration of temperature measurement. Compared with magnetic temperature measurement, this method introduces optical physical quantity, which greatly increases the amount of information contained in the measurement channel. On this basis,we introduce the characteristic matrix of membrane system, and the improved the Mean Field(MF) theory which can interpret superparamagnetism. Our experiment has demonstrated that the above theoretical model is feasible from low temperature to normal temperature. The thin film sensor element provides the necessary temperature information for cryogenic wind tunnel design and hypersonic vehicle surface model design in real time

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Section: Experiments and Resultsmentioning

confidence: 99%

“…According to the MF theory, the saturation magnetization [5,6,21,22], of an amorphous metal film with constituents can be expressed as:…”

Section: Coupling Between Magnetization and Temperaturementioning

confidence: 99%

Temperature measurement based on the magneto-optic Kerr effect in Ni nanofilms

Yi¹,

Zhu²,

Hou³

et al. 2022

Meas. Sci. Technol.

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show abstract

“…As shown in figure 1, the magnetic film considered in this study was iron metal. The saturation magnetisation and temperature of single-crystal iron, based on mean field theory, can be expressed as follows [24][25][26][27][28]:…”

Section: Magnetisation Strength Versus Temperaturementioning

confidence: 99%

Remote measurement of transient heat flux based on the thermomagnetic effect

Yi,

Cui,

et al. 2024

Meas. Sci. Technol.

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Heat flux is a physical quantity that characterises the strength of heat transfer per unit area. Heat transfer occurs with a temperature difference. Herein, a remote heat flux measurement method based on the thermomagnetic effect is proposed. Using Bloch’s law, Faraday’s law of electromagnetic induction, and Fourier’s law, a temperature measurement model from heat flux to magnetization of the magnetic film and finally to the induced electromotive force in the Helmholtz coil is established. A compression corner was fabricated, and the heat flux measurement method was experimentally verified in a Mach 6 shock tube wind tunnel. In addition, a Schlieren experiment was performed for comparison. In the experiments, the temperature resolution of the magnetic film reached 0.36 K, and the temperature response reached 100 kHz. The range of the proposed heat flux measurement method is up to 5 MW/〖mm〗^2, and the measurement error is less than 10%. At a resolution of 10 μs, the change in heat flow is mapped when there is a transition for the magnetic film from flat to turbulent flow, which shows the different effects of hypersonic heat flux on the boundary layer and attachment position. The magnetic thin film shows the potential for heat flux estimation in our experiment.

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TEMPERATURE DEPENDENCE OF THE AMORPHOUS SmTbFeCo MAGNETO-OPTICAL FILMS

Cited by 2 publications

References 8 publications

Temperature measurement based on the magneto-optic Kerr effect in Ni nanofilms

Temperature measurement based on the magneto-optic Kerr effect in Ni nanofilms

Remote measurement of transient heat flux based on the thermomagnetic effect

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