Measuring the transverse magnetization of rotating ferrofluids

J. P. Embs, S. May, C. Wagner, A. V. Kityk, A. Leschhorn, and M. Lücke
Phys. Rev. E 73, 036302 – Published 2 March 2006

Abstract

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 Ω. 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 Ω. However, like the other models, they overestimate their magnitudes.

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  • Received 19 August 2005

DOI:https://doi.org/10.1103/PhysRevE.73.036302

©2006 American Physical Society

Authors & Affiliations

J. P. Embs1,2,*, S. May3,4, C. Wagner3, A. V. Kityk5, A. Leschhorn2, and M. Lücke2

  • 1Technische Physik, Universität des Saarlandes, 66041 Saarbrücken, Germany
  • 2Theoretische Physik, Universität des Saarlandes, 66041 Saarbrücken, Germany
  • 3Experimentalphysik, Universität des Saarlandes, 66041 Saarbrücken, Germany
  • 4Department of Physics, University of Hull, HU6 7RX, United Kingdom
  • 5Institute for Computer Science, Electrical Engineering Department, Technical University of Czestochowa, Al. Armii Krajowej 17, PL-42200, Czestochowa, Poland

  • *Electronic address: jp.embs@mx.uni-saarland.de

Comments & Replies

Reply to “Comment on ‘Measuring the transverse magnetization of rotating ferrofluids’”

J. P. Embs, A. Leschhorn, and M. Lücke
Phys. Rev. E 78, 068302 (2008)

Comment on “Measuring the transverse magnetization of rotating ferrofluids”

Huei Chu Weng and Cha’o-Kuang Chen
Phys. Rev. E 78, 068301 (2008)

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Vol. 73, Iss. 3 — March 2006

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