1954
DOI: 10.1103/physrev.96.1487
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Low-Temperature Acoustic Relaxation in Ni—Fe Ferrites

Abstract: An acoustic relaxation effect occurs near 40°K in Nio.75Fe2.25O4 and is attributed to a stress-induced change in distribution of Fe ++ and Fe +++ similar to that occurring in magnetite. The process involves electron diffusion. The activation energy is between 0.026 and 0.055 ev per electron jump.

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Cited by 21 publications
(4 citation statements)
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“…Fine and Kenney 27 have measured sound absorption in single crystals of similar ferrites and found a loss peak which they identified with the same valence-electron rearrangement as that excited by stress. They deduced an activation energy of 0-026-0-055 eV, which is in reasonable agreement with the values found above.…”
Section: F) (31)mentioning
confidence: 93%
“…Fine and Kenney 27 have measured sound absorption in single crystals of similar ferrites and found a loss peak which they identified with the same valence-electron rearrangement as that excited by stress. They deduced an activation energy of 0-026-0-055 eV, which is in reasonable agreement with the values found above.…”
Section: F) (31)mentioning
confidence: 93%
“…The landmark is probably the seminal paper of Kittel [75], who explained the benefits of coupling acoustic-waves (AW) with spin-waves (SW) in order to confer to the former waveform a tunable and non-reciprocal character. Since then, the subject has accumulated a vast amount of literature that spans a wide range of ferromagnetic materials from metals [108], to magnetic semiconductors [109,110], and electrical insulators [111,112,113]. From the start, ferrite garnets [114] have been the subject of an intense focus because of their ultra-low internal frictions.…”
Section: Magneto-elastic Couplingmentioning
confidence: 99%

Spin Insulatronics

Brataas,
van Wees,
Klein
et al. 2020
Preprint
“…Fine and Kenney [12][13] have studied the internal friction in the single crystals of magnetite and Ni-Fe ferrite. Gibbons [14] studied the variation in internal friction with temperature for single crystals of manganese ferrite, magnetite, manganese zinc ferrite and nickel iron ferrites at low temperature using resonant piezoelectric method in the frequency range 100-150 kHz.…”
Section: Resume Of Important Investigations On the Internal Friction ...mentioning
confidence: 99%