Magneto-vortical birefringence in a ferrofluid

Heegaard, B. M.; Bacri, Jean‐Claude; Perzynski, R.; Shliomis, M. I.

doi:10.1209/epl/i1996-00454-4

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…Heegaard et al ͓7͔,and Gazeau et al ͓11͔ used magnetooptical birefringence to examine the local vorticity ⍀ of dilute ferrofluid flow. While they measured the angle between H and M by means of optical birefringence in a dilute ferrofluid sample, the subject to our research is to measure the same effect via the off-axis magnetization component in a nondilute ferrofluid.…”

Section: Introductionmentioning

confidence: 99%

Measuring the transverse magnetization of rotating ferrofluids

et al. 2006

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We report on measurements of the transverse magnetization of a ferrofluid rotating as a rigid body in a constant magnetic field, H0, applied perpendicular to the axis of rotation. The rotation of the fluid leads to a nonequilibrium situation, where the ferrofluid magnetization M and the magnetic field within the sample, H, are no longer parallel to each other. The off-axis magnetization perpendicular to H0 is measured as a function of both the applied magnetic field H0 and the angular frequency Omega. The latter ranges from a few hertz to frequencies well above a characteristic inverse Brownian relaxation time. Our experimental results strongly indicate that the transverse magnetization is caused only by a small fraction of the colloidal ferromagnetic particles. The effect of the polydispersity of the ferrofluid is discussed. Experimental results are compared to predictions based on several theoretical models. A single-time relaxation approach for the so-called effective field and a field-dependent Debye relaxation of M yield reasonably good shapes of the curves of transverse magnetization vs Omega. However, like the other models, they overestimate their magnitudes.

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Section: Introductionmentioning

confidence: 99%

Measuring the transverse magnetization of rotating ferrofluids

et al. 2006

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Ferrohydrodynamics: Retrospective and Issues

Shliomis

2002

Lecture Notes in Physics

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Magnetic fluid under vorticity: Free precession decay of magnetization and optical anisotropy

et al. 1996

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We submit a magnetic fluid to a solid rotation and analyze the free precession decay of its transverse magnetization and of its nondiagonal optical anisotropy. In agreement with the theoretical predictions, they present damped oscillations because the magnetic particles rotate, dragged by the carrier angular velocity. The node period is inversely proportional to vorticity. We show that magnetic particles can be used as advanced nanoscopic tools to probe neatly the vorticity of their fluid carrier. ͓S1063-651X͑96͒04310-3͔PACS number͑s͒: 47.32. Ϫy, 75.50.Mm, 42.25.Lc

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Magneto-vortical birefringence in a ferrofluid

Cited by 4 publications

References 12 publications

Measuring the transverse magnetization of rotating ferrofluids

Measuring the transverse magnetization of rotating ferrofluids

Ferrohydrodynamics: Retrospective and Issues

Magnetic fluid under vorticity: Free precession decay of magnetization and optical anisotropy

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