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Giant magnetoacoustic effect in KMnF3 due to nuclear spin waves

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Abstract

An explanation is proposed for the gigantic magnetoacoustic effect that we observed in KMnF3 in previous work {Kh. G. Bogdanova, V. A. Golenishchev-Kutuzov, M. I. Kurkin et al., Zh. Éksp. Teor. Fiz. 112, 1830 (1997) [JETP 85, 1001 (1997)]}. The effect entails a tenfold amplitude reduction of an acoustic pulse in a magnetic field that varies over the range 0–8 kOe. It is shown that this effect is due to the interference of two nuclear magnetoelastic waves propagating in the sample under magnetoacoustic resonance conditions, if this resonance occurs in the region of strong spatial dispersion of nuclear spin waves. The effect is said to be gigantic because it exceeds in magnitude the magnetoacoustic effects observed previously in magnetically ordered materials even though it is due to nuclear magnetism, which is 105 times weaker than electronic magnetism. We observe a concomitant anomalous dependence of the dispersion of the velocity of sound on the external magnetic field.

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Authors and Affiliations

  1. E. K. Zavoiskii Kazan’ Physicotechnical Institute, Russian Academy of Sciences, 420029, Kazan’, Russia

    Kh. G. Bogdanova, V. A. Golenishchev-Kutuzov, V. E. Leont’ev, M. R. Nazipov & M. M. Shakirzyanov

  2. Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, 620219, Ekaterinburg, Russia

    M. I. Kurkin

  3. P. L. Kapitsa Institute of Physics Problems, Russian Academy of Sciences, 117334, Moscow, Russia

    S. V. Petrov

Authors
  1. Kh. G. Bogdanova
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  2. V. A. Golenishchev-Kutuzov
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  3. V. E. Leont’ev
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  4. M. R. Nazipov
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  5. M. M. Shakirzyanov
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  6. M. I. Kurkin
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  7. S. V. Petrov
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Additional information

Zh. Éksp. Teor. Fiz. 115, 1727–1739 (May 1999)

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Bogdanova, K.G., Golenishchev-Kutuzov, V.A., Leont’ev, V.E. et al. Giant magnetoacoustic effect in KMnF3 due to nuclear spin waves. J. Exp. Theor. Phys. 88, 947–953 (1999). https://doi.org/10.1134/1.558876

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  • DOI: https://doi.org/10.1134/1.558876

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