Abstract

The paper revisits previously reported apparent ideal diamagnetism in graphene–n-heptane–permalloy systems. The authors report that similar magnetic signals are also observed without graphene, suggesting that graphene is not responsible for the effect. They propose that field redistribution caused by inhomogeneities in the permalloy foil and experimental geometry can mimic ideal diamagnetism in ultra-low-field measurements. A COMSOL-based magnetostatic model is used qualitatively to illustrate one-sided magnetic flux redistribution (Mallinson effect).

Abstract

The paper revisits previously reported apparent ideal diamagnetism in graphene–n-heptane–permalloy systems. The authors report that similar magnetic signals are also observed without graphene, suggesting that graphene is not responsible for the effect. They propose that field redistribution caused by inhomogeneities in the permalloy foil and experimental geometry can mimic ideal diamagnetism in ultra-low-field measurements. A COMSOL-based magnetostatic model is used qualitatively to illustrate one-sided magnetic flux redistribution (Mallinson effect).

Abstract

The paper revisits previously reported apparent ideal diamagnetism in graphene–n-heptane–permalloy systems. The authors report that similar magnetic signals are also observed without graphene, suggesting that graphene is not responsible for the effect. They propose that field redistribution caused by inhomogeneities in the permalloy foil and experimental geometry can mimic ideal diamagnetism in ultra-low-field measurements. A COMSOL-based magnetostatic model is used qualitatively to illustrate one-sided magnetic flux redistribution (Mallinson effect).

Abstract

The paper revisits previously reported apparent ideal diamagnetism in graphene–n-heptane–permalloy systems. The authors report that similar magnetic signals are also observed without graphene, suggesting that graphene is not responsible for the effect. They propose that field redistribution caused by inhomogeneities in the permalloy foil and experimental geometry can mimic ideal diamagnetism in ultra-low-field measurements. A COMSOL-based magnetostatic model is used qualitatively to illustrate one-sided magnetic flux redistribution (Mallinson effect).