Spin-Selective Anisotropic Magnetoresistance Driven by Chirality in DNA

Abstract

The magnetoresistance (MR) measurements of a ferromagnetic (FM) surface functionalized with 30 base-pairs DNA molecules (30bp-dsDNA) is measured both as a function of the angle between the surface normal and magnetization direction and as a function of temperature. In particular, the angular dependence MR follows a periodic pattern passing through zero for the in-plane magnetization of the ferromagnetic surface, i.e., 90° to the minimum/maximum value of MR for the out-of-plane magnetization, i.e., 0°/180°. This is a clear-cut demonstration of the spatial dependence (anisotropy) of the chiral-induced spin (CISS) selectivity effect. Remarkably, the anisotropic nature of magnetoresistance in chiral molecular systems demonstrates their significant potential application in the field of organic spintronics, paving the way for innovative developments in spin-based devices.