Abstract
At least four types of sub-domain magnetic moments, on a scale smaller than the main domain structure, could contribute to pseudo-single-domain intensities of TRM (thermoremanent magnetization) in small multidomain grains. Of these, moments pinned by the stress fields of dislocations, surface moments, and moments due to the Barkhausen discreteness of domain wall positions are either strongly shielded by the magnetically soft matrix, subject to the internal demagnetizing field during magnetization changes, or so coupled to the domain structure that they cannot change magnetization independently. Only the net moments of domain walls themselves qualify as ‘psarks’—subdomain moments with truly single-domain behaviour. A new reversal mode, domain wall inversion or curling, is postulated to explain the incoherent reversal of domain wall moments. It amounts to nucleating and propagating a Bloch line across a 180° domain wall.
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References
Amar, H., Magnetization mechanism and domain structure of multi-domain particles, Phys. Rev., 111, 149–153, 1958.
Banerjee, S. K., On the origin of stable remanence in pseudo-single domain grains, J. Geomag. Geoelectr., 29, 319–329, 1977.
Bean, C. P. and J. D. Livingston, Superparamagnetism, J. Appl. Phys., 30, 120S–129S, 1959.
Brown, W. F., Virtues and weaknesses of the domain concept, Rev. Mod. Phys., 17, 15–19, 1945.
Brown, W. F., Rigorous approach to the theory of ferromagnetic microstructure, J. Appl. Phys., 29, 470–471, 1958.
Brown, W. F., Micromagnetics, pp. 143, Interscience, New York, 1963.
Butler, R. F. and S. K. Banerjee, Theoretical single-domain grain size range in magnetite and titanomagnetite, J. Geophys. Res., 80, 4049–4058, 1975.
Davis, P. M. and M. E. Evans, Interacting single-domain properties of magnetite intergrowths, J. Geophys. Res., 81, 989–994, 1976.
Day, R., TRM and its variation with grain size: a review, J. Geomag. Geoelectr., 29, 233–265, 1977.
De Blois, R. W. and C. D. Graham, Domain observations on iron whiskers, J. Appl. Phys., 29, 931–939, 1958.
Dickson, G. O., C. W. F. Everitt, L. G. Parry, and F. D. Stacey, Origin of thermoremanent magnetization, Earth Planet. Sci. Lett., 1, 222–224, 1966.
Dunlop, D. J., Magnetite: behavior near the single-domain threshold, Science, 176, 41–43, 1972.
Dunlop, D. J., Thermoremanent magnetization in submicroscopic magnetite, J. Geophys. Res., 78, 7602–7613, 1973a.
Dunlop, D. J., Theory of the magnetic viscosity of lunar and terrestrial rocks, Rev. Geophys. Space Phys., 11, 855–901, 1973b.
Dunlop, D. J., Superparamagnetic and single-domain threshold sizes in magnetite, J. Geophys. Res., 78, 1780–1793, 1973c.
Dunlop, D. J., The hunting of the ‘psark’ (abstract), EOS (Trans. Am. Geophys. Union), 57, 904, 1976a.
Dunlop, D. J., Thermal fluctuation analysis: a new technique in rock magnetism, J. Geophys. Res., 81, 3511–3517, 1976b.
Dunlop, D. J., Magnetic hysteresis of single-domain and two-domain iron oxide particles, in preparation, 1977.
Dunlop, D. J. and M-M. Bina, The coercive force spectrum of magnetite at high temperatures: evidence for thermal activation below the blocking temperature, Geophys. J. R. Astron. Soc., 1977 (in press).
Dunlop, D. J. and E. D. Waddington, The field dependence of thermoremanent magnetization in igneous rocks, Earth Planet. Sci. Lett., 25, 11–25, 1975.
Dunlop, D. J. and G. F. West, An experimental evaluation of single-domain theories, Rev. Geophys. Space Phys., 7, 709–757, 1969.
Dunlop, D. J., F. D. Stacey, and D. E. W. Gillingham, The origin of thermoremanent magnetization: contribution of pseudo-single-domain magnetic moments, Earth Planet. Sci. Lett., 21, 288–294, 1974.
Evans, M. E., Single domain oxide particles as a source of thermoremanent magnetization, J. Geomag. Geoelectr., 29, 261–215, 1977.
Fletcher, E. J. and W. O’Reilly, Contribution of Fe2+ ions to the magnetocrystalline anisotropy constant K1 of Fe3-xTix (0<x<T0.1), Proc. Phys. Soc. (London), Solid State Phys., 7, 171–178, 1974.
Frei, E. H., S. Shtrikman, and D. Treves, Critical size and nucleation field of ideal ferromagnetic particles, Phys. Rev., 106, 446–455, 1957.
Galt, J. K., Motion of a ferromagnetic domain wall in Fe3O4, Phys. Rev., 85, 664–669, 1952.
Kneller, E. F. and F. E. Luborsky, Particle size dependence and remanence of single-domain particles, J. Appl. Phys., 34, 656–658, 1963.
Mcnab, T. K., R. A. Fox, and A. J. F. Boyle, Some magnetic properties of magnetite (Fe3O4) micro- crystals, J. Appl. Phys., 39, 5703–5711, 1968.
Merrill, R. T., The demagnetization field of multidomain grains, J. Geomag. Geoelectr., 29, 285–292, 1977.
Néel, L., Théorie du trainage magnétique des ferromagnétiques en grains fins avec applications aux terres cuites, Ann. Géophys., 5, 99–136, 1949.
Néel, L., Théorie du trainage magnétique des substances massives dans le domaine de Rayleigh, J. Phys. Radium, 11, 49–61, 1950.
Néel, L., Some theoretical aspects of rock magnetism, Adv. Phys., 4, 191–242, 1955.
Ozima, M. and M. Ozima, Origin of thermoremanent magnetization, J. Geophys. Res., 70, 1363–1369, 1965.
Parry, L.G., Magnetic properties of dispersed magnetite powders, Philos. Mag., 11, 303–312, 1965.
Schmidt, V. A., A multidomain model of thermoremanence, Earth Planet. Sci. Lett., 20, 440–446, 1973.
Shive, P. N., Dislocation control of magnetization, J. Geomag. Geoelectr., 21, 519–529, 1969.
Shtrikman, S. and D. Treves, Internal structure of Bloch walls, J. Appl Phys., 31, 147S–148S, 1960.
Soffel, H. C., Domain structure of titanomagnetites and its variation with temperature, J. Geomag. Geoelectr., 29, 277–284, 1977.
Stacey, F. D., A generalized theory of thermoremanence, covering the transition from single domain to multidomain magnetic grains, Philos. Mag., 7, 1887–1900, 1962.
Stacey, F. D., The physical theory of rock magnetism, Adv. Phys., 12, 45–133, 1963.
Stacey, F. D. and S. K. Banerjee, The Physical Principles of Rock Magnetism, pp. 195, Elsevier, New York, 1974.
Stephenson, A., The observed moment of a magnetized inclusion of high Curie point within a titanomagnetite particle of lower Curie point, Geophys. J. R. Astron. Soc., 40, 29–36, 1975.
Stoner, E. C. and E. P. Wohlfarth, A mechanism of magnetic hysteresis in heterogeneous alloys, Philos. Trans. R. Soc. (London), Ser. A, 240, 599–642, 1948.
Strangway, D. W., E. E. Larson, and M. Goldstein, A possible cause of high magnetic stability in volcanic rocks, J. Geophys. Res., 73, 3787–3795, 1968.
Street, R. and J. C. Woolley, A study of magnetic viscosity, Proc. Phys. Soc. (London), Ser. A, 62, 562–572, 1949.
Verhoogen, J., The origin of thermoremanent magnetization, J. Geophys. Res., 64, 2441–2449, 1959.
Wohlfarth, E.P., The remanent magnetization of haematite powders, Philos. Mag., 46, 1155–1164, 1955.
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Dunlop, D.J. (1977). The Hunting of the ‘Psark’. In: Dunlop, D.J. (eds) Origin of Thermoremanent Magnetization. Advances in Earth and Planetary Sciences, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1286-7_5
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DOI: https://doi.org/10.1007/978-94-010-1286-7_5
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