Fig. 4: Structure information and magnetization measurements on HOPG.
From: Organic magnetoelectric and optomagnetic couplings: perspectives for organic spin optoelectronics
a Schematic models of 2D in-plane magnetized grain boundaries propagating through bulk HOPG. b STM image of a grain boundary on HOPG showing a 1D superlattice with a small periodicity D = 1.4 nm. In-plane c, d SQUID magnetization measurements on HOPG after subtraction of the diamagnetic signal at 5 K and 300 K. Reproduced from Cervenka et al.91 with permission from the Nature Publishing Group.
