کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8907196 | 1634673 | 2018 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The magnetic structure and palaeomagnetic recording fidelity of sub-micron greigite (Fe3S4)
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The magnetic structure and palaeomagnetic recording fidelity of sub-micron greigite (Fe3S4) The magnetic structure and palaeomagnetic recording fidelity of sub-micron greigite (Fe3S4)](/preview/png/8907196.png)
چکیده انگلیسی
We present the results of a finite-element micromagnetic model of 30nm to 300nm greigite (Fe3S4) grains with a variety of equant morphologies. This grain size range covers the magnetic single-domain (SD) to pseudo single-domain (PSD) transition, and possibly also the PSD to multi-domain (MD) transition. The SD-PSD threshold d0 is determined to be 50nmâ¤d0â¤56nm depending on grain shape. The nudged elastic-band method was used to determine the room temperature energy barriers between stable states and thus the blocking volumes. It is found that, in the absence of interparticle magnetostatic interactions, the magnetisation of equant SD greigite is not stable on a geological scale and only PSD grains â¥70nm can be expected to carry a stable magnetisation over billion-year timescales, i.e., all non-interacting SD particles are essentially superparamagnetic. We further identify a mechanism for the PSD to multi-domain (MD) transition, which is of a continuous nature from PSD nucleation up to 300nm, when structures typical of MD behaviour like closure domains begin to form.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 483, 1 February 2018, Pages 76-89
Journal: Earth and Planetary Science Letters - Volume 483, 1 February 2018, Pages 76-89
نویسندگان
Miguel A. Valdez-Grijalva, Lesleis Nagy, Adrian R. Muxworthy, Wyn Williams, Karl Fabian,