rock magnetism and domain states

Nagy et al., 2017

single vortex domain states in magnetite are more stable than single domain and can retain their recordings for billions of years

Nagy et al., 2017

focus on idea shaped grains and only look at magnetite. extrapolated to ling timescales because we cannot watch something for billions of years

Nagy et al., 2019

the transition from single vortex to multidomain in magnetite occurs at 3 microns. multidomain walls are unstable and move depending on applied fields

Nagy et al., 2019

grain size limited due to computational expense. only magnetite

Roberts et al., 2019

the day diagram is problematic because it used the PSD field as a catch all for things that aren't multidomain or single domain and it is an average of all the grains in a sample. FORC diagrams are better

Roberts et al., 2019

only test 10 alternative approaches and the effectiveness of each approach may depend on the mineral

Tauxe et al., 2021

blocking temperature at which pTRM is acquired should equal the unblocking temperature. failure of this leads to saggy arai plots. failure is more common in old or large grains because they relax overtime

Tauxe et al., 2021

doesnt quantify the timescale of aging. focuses on igneous lava samples so may be different in other rock types

williams et al., 2024

on the day diagram there is a well defined trend between SD and MD with grain size. position of the vortex grain on the day plot depends on size and shape, large and flat = close to MD; small and elongate = close to SD

Williams et al., 2024

idealised particle shapes. only looked at magnetite with no impurities