LOW-TEMPERATURE CYCLING OF ISOTHERMAL AND ANHYSTERETIC REMANENCE: MICROCOERCIVITY AND MAGNETIC MEMORY
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dc.contributor.author | Muxworthy A.R. | |
dc.contributor.author | Dunlop D.J. | |
dc.contributor.author | Ozdemir O. | |
dc.date.accessioned | 2021-12-20T03:45:27Z | |
dc.date.available | 2021-12-20T03:45:27Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=1329983 | |
dc.identifier.citation | Earth and Planetary Science Letters, 2003, 205, 3-4, 173-184 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/33648 | |
dc.description.abstract | This paper reports low-temperature cycling (LTC) through the Verwey transition of anhysteretic remanence (ARM), partial ARMs and partially demagnetised saturation isothermal remanence (SIRM) induced at room temperature in pseudo-single-domain and multidomain (MD) magnetite. The remanences were cooled in zero field to 50 K and then heated back to room temperature. By inducing partial ARMs over different field ranges and by partially alternating field demagnetising SIRMs, it was possible to isolate both low-coercive-force and high-coercive-force fractions of remanence. On cooling through the Verwey transition, a sharp increase in the remanence was observed. The relative size of the jump increased as the high-coercive-force fraction was increasingly isolated. This behaviour is interpreted as being due to both an increase in the single-domain/multidomain threshold size on cooling through the Verwey transition and to the reduction or elimination of closure domains in the low-temperature phase. In addition, the memory ratio, i.e. the fraction of remanence remaining after LTC divided by the initial remanence, was found to be higher for the high-coercive-force fraction than the low-coercive-force fraction. In our interpretation, the high-coercivity fraction behaviour is associated with reversible domain re-organisation effects, whilst the low-coercive force fraction's behaviour is associated with irreversible domain re-organisation and (de-)nucleation processes. Due to the decrease in magnetocrystalline anisotropy on cooling to the Verwey transition, the high-coercive-force fraction is likely to be magnetoelastically controlled. Thus, a rock displaying high-coercive-force behaviour is likely to carry a palaeomagnetically meaningful remanence with high unblocking temperatures. In addition, LTC analysis can be used to identify the domain state dominating the natural remanence in magnetite-bearing rocks. | |
dc.subject | MAGNETITE | |
dc.subject | VERWEY TRANSITION | |
dc.subject | DOMAIN STATE | |
dc.subject | COERCIVITY | |
dc.subject | REMANENCE | |
dc.title | LOW-TEMPERATURE CYCLING OF ISOTHERMAL AND ANHYSTERETIC REMANENCE: MICROCOERCIVITY AND MAGNETIC MEMORY | |
dc.type | Статья |
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