Rotatable initial susceptibility in evaporated cobalt films

Abstract

The magnetization reversal process in evaporated cobalt films in the thickness range 1000-4000 Å has been studied by use of the transverse Kerr effect to display hysteresis loops and the longitudinal Kerr effect to observe magnetic domain structures. The samples investigated all exhibit a rotatable initial susceptibility and an unusual mode of magnetization reversal, which suggests that the films behave as random assemblies of magnetostatically interacting uniaxial crystallites.

Low Magnetic Field Induced Surface Enhanced Transient Spin-Trajectory Modulation of a Prototype Anticancer Drug Sanguinarine on a Single Domain Superparamagnetic Nanosurface

“…or triplet ( T n ; n = 1, 2, 3, etc.). There are reports on the formation of different excited spin states (singlet and triplet) when one electron from the singlet ground state (S 0 ) is being excited to a higher energy level (S n or T n ) either by preserving (spin-conservation), , reversal (spin-flipping), , rephasing (spin-flopping), , or noncollinear spin arrangement (spin-canting) of their original spin orientation. − Since the spin reversal process is not an allowed transition governed by the spin selection rule, optomolecular excitations are singlet–singlet (S–S) type exclusively, and passage to triplet excited states is primarily governed by excited state tunnelling or conical intersection, which we generally define as intersystem crossing (ISC). , In contrast, ferrimagnetic or ferromagnetic nanostructures and especially single-domain superparamagnetic nanosurfaces , induce several different unusual spin dynamics of electrons in surface adsorbed organic molecules by applying a small external magnetic field . These spin dynamics include enhanced electronic and magnetic quantum efficiency, , population inversion, introduction of trap-sites by balancing of injection and recombination of charge carriers, or even unusual photochemical reaction pathways , to find real life applications in organic conductors and crucial biochemical reactions along with their potential functions as molecular ruler to estimate the extent of drug release for effective therapy.…”