title: Electron Paramagnetic Resonance of Single Magnetic Moment on a Surface.
abstract: We address electron spin resonance of single magnetic moments in a tunnel junction using time-dependent electric fields and spin-polarized current. We show that the tunneling current directly depends on the local magnetic moment and that the frequency of the external electric field mixes with the characteristic Larmor frequency of the local spin. The importance of the spin-polarized current induced anisotropy fields acting on the local spin moment is, moreover, demonstrated. Our proposed model thus explains the absence of an electron spin resonance for a half integer spin, in contrast with the strong signal observed for an integer spin.
authors.affiliation: Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 21 Uppsala, Sweden.
authors.forename: P
authors.initials: P
authors.lastname: Berggren
authors.affiliation: Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 21 Uppsala, Sweden.
authors.forename: J
authors.initials: J
authors.lastname: Fransson