000058379 001__ 58379
000058379 005__ 20170503140337.0
000058379 0247_ $$2doi$$a10.1016/j.epsl.2014.04.016
000058379 0248_ $$2sideral$$a86484
000058379 037__ $$aART-2014-86484
000058379 041__ $$aeng
000058379 100__ $$aBryson, J.F.J.
000058379 245__ $$aNanopaleomagnetism of meteoritic Fe-Ni studied using X-ray photoemission electron microscopy
000058379 260__ $$c2014
000058379 5060_ $$aAccess copy available to the general public$$fUnrestricted
000058379 5203_ $$aX-ray photoemission electron microscopy (XPEEM) enables natural remanent magnetisation to be imaged with ~30 nm~30 nm resolution across a field of view of 5–20 µm. The method is applied to structural features typical of the Widmanstätten microstructure (kamacite – tetrataenite rim – cloudy zone – plessite) in the Tazewell IIICD iron meteorite. Kamacite lamellae and the tetrataenite rim are multidomain, whereas plessite consists of laths of different phases displaying a range of stable magnetisation directions. The cloudy zone (CZ) displays a complex interlocking domain pattern resulting from nanoscale islands of tetrataenite with easy axes distributed along three possible crystallographic directions. Quantitative analysis of the coarse and intermediate CZ was achieved using a combination of image simulations and histogram profile matching. Remanence information was extracted from individual regions of interest ~400 nm~400 nm wide, demonstrating for the first time the capability of XPEEM to perform quantitative paleomagnetic analysis at sub-micron length scales. The three tetrataenite easy axis orientations occur with equal probability in the coarse and intermediate CZ, suggesting that spinodal decomposition in these regions was not strongly influenced by internal interaction fields, and that they are suitable candidates for future paleomagnetic studies. The fine CZ shows a strong dominance of one easy axis. This effect is attributed to island–island exchange interactions that render the fine CZ unsuitable for paleomagnetic study. Variations in the relative strength (proportion of dominant easy axis) and direction (direction of dominant easy axis) of a paleomagnetic field can be resolved from different regions of the CZ using XPEEM, raising the prospect of obtaining a time-resolved measurement of the active dynamo period in meteorites originating from the upper unmelted regions of differentiated asteroids (e.g. chondrites, pallasites,
000058379 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000058379 590__ $$a4.734$$b2014
000058379 591__ $$aGEOCHEMISTRY & GEOPHYSICS$$b5 / 79 = 0.063$$c2014$$dQ1$$eT1
000058379 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000058379 700__ $$0(orcid)0000-0002-0901-8341$$aHerrero-Albillos, J.
000058379 700__ $$aKronast, F.
000058379 700__ $$aGhidini, M.
000058379 700__ $$aRedfern, S.A.T.
000058379 700__ $$aVan, der Laan
000058379 700__ $$aHarrison, R.J.
000058379 773__ $$g396 (2014), 125-133$$pEarth planet. sci. lett.$$tEARTH AND PLANETARY SCIENCE LETTERS$$x0012-821X
000058379 8564_ $$s402814$$uhttps://zaguan.unizar.es/record/58379/files/texto_completo.pdf$$yVersión publicada
000058379 8564_ $$s97487$$uhttps://zaguan.unizar.es/record/58379/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000058379 909CO $$ooai:zaguan.unizar.es:58379$$particulos$$pdriver
000058379 951__ $$a2017-05-03-13:58:14
000058379 980__ $$aARTICLE