In this section
@article{Valdez-Grijalva:2018:10.1016/j.epsl.2018.08.027,
author = {Valdez-Grijalva, MA and Muxworthy, AR and Williams, W and ó, Conbhui P and Nagy, L and Roberts, AP and Heslop, D},
doi = {10.1016/j.epsl.2018.08.027},
journal = {Earth and Planetary Science Letters},
pages = {103--111},
title = {Magnetic vortex effects on first-order reversal curve (FORC) diagrams for greigite dispersions},
url = {http://dx.doi.org/10.1016/j.epsl.2018.08.027},
volume = {501},
year = {2018}
}
TY - JOUR
AB - First-order reversal curve (FORC) diagrams are used increasingly in geophysics for magnetic domain state identification. The domain state of a magnetic particle is highly sensitive to particle size, about which FORC diagrams provide valuable information. However, the FORC signal of particles with nonuniform magnetisations, which are the main carrier of natural remanent magnetisations in many systems, is still poorly understood. In this study, the properties of non-interacting, randomly oriented dispersions of greigite (Fe3S4) in the uniform single-domain (SD) to non-uniform single-vortex (SV) size range are investigated via micromagnetic calculations. Signals for SD particles () are found to be in excellent agreement with previous SD coherent-rotation studies. A transitional range from to is identified for which a mixture of SD and SV behaviour produces complex FORC diagrams. Particles have purely SV behaviour with the remanent state for all particles in the ensemble in the SV state. It is found that for SV ensembles the FORC diagram provides a map of vortex nucleation and annihilation fields and that the FORC distribution peak should not be interpreted as the coercivity of the sample, but as a vortex annihilation field on the path to saturation.
AU - Valdez-Grijalva,MA
AU - Muxworthy,AR
AU - Williams,W
AU - ó,Conbhui P
AU - Nagy,L
AU - Roberts,AP
AU - Heslop,D
DO - 10.1016/j.epsl.2018.08.027
EP - 111
PY - 2018///
SN - 0012-821X
SP - 103
TI - Magnetic vortex effects on first-order reversal curve (FORC) diagrams for greigite dispersions
T2 - Earth and Planetary Science Letters
UR - http://dx.doi.org/10.1016/j.epsl.2018.08.027
UR - http://hdl.handle.net/10044/1/63569
VL - 501
ER -