Single-Molecule Nanomagnets

Single-electron transport in electrically tunable nanomagnets.

We study a single-electron transistor (SET) based upon a II-VI semiconductor quantum dot doped with a single-Mn ion. We present evidence that this system behaves like a quantum nanomagnet whose total spin and magnetic anisotropy depend dramatically both on the number of carriers and their orbital nature. Thereby, the magnetic properties of the nanomagnet can be controlled electrically. Converse...

Designing magnetic superlattices that are composed of single domain nanomagnets

BACKGROUND The complex nature of the magnetic interactions between any number of nanosized elements of a magnetic superlattice can be described by the generic behavior that is presented here. The hysteresis characteristics of interacting elliptical nanomagnets are described by a quasi-static method that identifies the critical boundaries between magnetic phases. A full dynamical analysis is con...

Dynamics of ferromagnetic nanomagnets with vortex or single-domain configuration

We study the dynamics of flat circular permalloy nanomagnets for 1.) magnetic vortex and 2.) single-domain configurations using micromagnetic simulation. Dynamical studies for isolated vortex structures show that both the vorticity and the polarity of the out-of-plane component can be switched fast (50-100 ps). Micromagnetic simulations of the switching process in thin cylindrical Permalloy(Py)...

Breaking the configurational anisotropy in Fe single crystal nanomagnets

Single-Molecule FISH ▶ Single-Molecule RNA FISH Single-Molecule Fluorescence Resonance Energy Transfer

In this article, we review smFRET, a powerful technique for measuring distances and monitoring dynamics at the molecular scale. In this technique, the researcher monitors distances between two or more individual fluorescent labels by measuring how efficiently electronic energy is transferred between them, a phenomenon known as ▶ F€orster resonance energy transfer (FRET). Its power lies in its a...