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A.C. susceptibility as a probe of low-frequency magnetic dynamics

Research output: Contribution to journalReview article


C. V. Topping, S. J. Blundell

School/Research organisations


The experimental technique of a.c. susceptibility can be used as a probe of magnetic dynamics in a wide variety of systems. Its use is restricted to the low-frequency regime and thus is sensitive to relatively slow processes. Rather than measuring the dynamics of single spins, a.c. susceptibility can be used to probe the dynamics of collective objects, such as domain walls in ferromagnets or vortex matter in superconductors. In some frustrated systems, such as spin glasses, the complex interactions lead to substantial spectral weight of fluctuations in the low-frequency regime, and thus a.c. susceptibility can play a unique role. We review the theory underlying the technique and magnetic dynamics more generally and give applications of a.c. susceptibility to a wide variety of experimental situations.


Original languageEnglish
Article number013001
Number of pages27
JournalJournal of Physics: Condensed Matter
Issue number1
Publication statusPublished - 30 Nov 2018

    Research areas

  • Magnetic measurements, A.C. susceptibility, Spin glass, Single molecule magnet, Superconductor, Spin ice

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