Dielectric behaviour of a ferrofluid subjected to a uniform magnetic field

Mailfert, A.; Nahounou, B.

doi:10.1109/tmag.1980.1060602

Cited by 57 publications

(26 citation statements)

References 2 publications

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“…Coefficients of E , = A + B / T given on Table l lead, for These results are in agreement with theoretical calculations which take into account either the shape of magnetic particles or their spatial distribution [12,13]. These calculations predict an anisotropy described by in a polar liquid, this effect seems slightly reduced.…”

Section: Static Permittivitysupporting

confidence: 85%

Dielectric anisotropy of the magnetic fluid cobalt ferrite in dibutylphthalate

Jorat

Siblini

Blanc-Mignon

et al. 1994

IEEE Trans. Dielect. Electr. Insul.

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This paper presents an experimental dielectric study of a ferrofluid, magnetic particles of FeaCoOd dispersed in dibutyl phthalate at different volume concentrations over a large temperature range (40 t o -lOO.C),, between 1 mHz and 10 MHa, with and without a continuous axial or radial magnetic field. The analysis of static permittivity indicates that the magnetodielectric anisotropy which exists at room temperature, persists at lower temperature, near the glass transition temperature of the carrier liquid. Moreover these results show a possible existence and growth of aggregates at the upper concentrations of ferrites. The position of the relaxation peaks of different solutions is modified by the presence of an axial continuous magnetic field.

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Section: Static Permittivitysupporting

confidence: 85%

Dielectric anisotropy of the magnetic fluid cobalt ferrite in dibutylphthalate

Jorat

Siblini

Blanc-Mignon

et al. 1994

IEEE Trans. Dielect. Electr. Insul.

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show abstract

“…The arrangement of nanoparticles has close relationship with the external magnetic field's intensity, leading to a decreased refractive index of the magnetic fluid with an increased magnetic field. This phenomenon is explained by the magneto-electric effect [52] of the magnetic fluid. So the reflected wavelength of the FBG shifts to shorter wavelength with the effective refractive index changed by magnetic fluid setting in an increased magnetic field.…”

Section: Optical Fiber Magnetic Filed Sensor Developmentmentioning

confidence: 96%

Review on optical fiber sensors with sensitive thin films

Yang

Dai

2011

Photonic Sens

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Abstract:The combination of fiber optics with nano-structure technologies and sensitive thin films offers great potential for the realization of novel sensor concepts. Miniatured optical fiber sensors with thin films as sensitive elements could open new fields for optical fiber sensor applications. Thin films work as sensitive elements and transducer to get response and feedback from environments, in which optical fibers are employed to work as signal carrier. This article presents some research work conducted at the National Engineering Laboratory for Optical Fiber Sensing Technologies in recent years. Concrete examples are: Pd/WO 3 co-sputtered coating as sensing material for optical hydrogen sensors shows robust mechanical stability and meanwhile good sensing performance; TbDyFe magnetostrictive coating directly deposited on fiber Bragg grating (FBG) demonstrates its possibility of miniature optical magnetic field/current sensors, and 40-pm shift of the FBG wavelength happens at a magnetic field order of 50 mT.

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“…When the magnetic field increase to 16mT, the wavelength shift of SPFBG is 35pm. This phenomenon has been explained by magneto-electric effect[9] of magnetic fluid. When there is no magnetic field, the ferromagnetic particles are uniformly dispersed in the solvent.…”

mentioning

confidence: 96%

Magnetic field sensor based on magnetic fluid with side-polished fiber Bragg grating

Dai

Yang

2011

SPIE Proceedings

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A novel optical fiber magnetic sensor based on magnetic fluid is proposed in this paper. Stable nano-particle CoFe 2 O 4 magnetic fluid was synthesized firstly; the CoFe 2 O 4 magnetic fluid was injected in capillaries containing side-polished fiber Bragg grating (SPFBG) as sensing element. The reflected Bragg wavelength was changed by varying the magnetic field which is perpendicular to the axial of SPFBG. Magnetic field sensing experiment show that 35pm of wavelength shift at a magnetic field intensity of 16mT.

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Dielectric behaviour of a ferrofluid subjected to a uniform magnetic field

Cited by 57 publications

References 2 publications

Dielectric anisotropy of the magnetic fluid cobalt ferrite in dibutylphthalate

Dielectric anisotropy of the magnetic fluid cobalt ferrite in dibutylphthalate

Review on optical fiber sensors with sensitive thin films

Magnetic field sensor based on magnetic fluid with side-polished fiber Bragg grating

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