“…In addition, numerical calculations were implemented to calculate magnetic energy and magnetic moments of MMP (Acosta‐Avalos et al., 2012) and critical single domain (SD) threshold sizes in greigite magnetosome chains (Muxworthy et al., 2013). Yet, the magnetic properties of greigite magnetosomes are much less known compared to the extensively investigated magnetite counterparts (e.g., Li et al., 2010; Moskowitz et al., 1993, 1989; Pan et al., 2005) and abiotic greigite crystals (e.g., Chang et al., 2007, 2008; Roberts, Chang, et al., 2011; Snowball, 1991, 1997a, 1997b; Valdez‐Grijalva et al., 2018, 2020), because of the difficulties in isolating and culturing greigite MTB (Bazylinski & Frankel, 2004; Lefèvre et al., 2011) to obtain pure biogenic greigite samples. Moreover, greigite magnetosome chains often appear to be disordered and the magnetic consequences of this remain unclear.…”