Magnetization signals in μm-thin lamellae of highly oriented pyrolytic graphite: a field-dependent study

Unusual butterfly-shaped magnetization signals and spin-glass-like behaviour in highly oriented pyrolytic graphite

“…Instead, a highly oriented arrangement characterized by an intense 100 reflection could be found in HOPG2 (Fig. 1D) [12,16]. Presence of ferromagnetic hysteresis was revealed by magnetization vs field measurements of HOPG1 with the c-axis perpendicular to the applied field (Fig.…”

“…with the presence of pre-existing ferromagnetic clusters. No superconductive components were detected, implying possible absence of superconductivity in HOPG2[2,16]. In order to confirm the origin of the butterfly shaped signal shown in Fig.3F, additional analyses were performed on µm-sized lamellae exfoliated from the inner regions of the HOPG2 structure.…”