Synopsis

An all-organic almost one-dimensional ferromagnet

Physics 3, s156
A new compound is found to be the best yet fully organic realization of a one-dimensional ferromagnet.
Credit: T. Sugano et al., Phys Rev. B (2010)

Organic magnets provide a fascinating playground for testing models of magnetism, as rich carbon chemistry allows one to tune the magnetic, optical, and other properties of these materials. Nitronyl nitroxides are a family of particularly versatile organic radicals, which provided the first example of a purely organic ferromagnet p-NPNN, formed by chains of weakly interacting molecules.

In a Rapid Communication published in Physical Review B, Tadashi Sugano and collaborators from Japan and the UK use muon-spin rotation and electron spin resonance techniques to study 2-benzimidazolyl nitronyl nitroxide ( 2-BIMNN), another member of the nitronyl nitroxides family. They find that 2-BIMMN displays long-range ferromagnetic ordering, with a transition temperature of Tc=1K. In the short list of quasi-one-dimensional purely organic ferromagnets, 2-BIMMN turns out to be especially interesting, as the ratio of the transition temperature to the exchange energy J that describes intrachain spin-spin interactions is small, indicating that the coupling between different chains is extremely weak, and therefore 2-BIMMN can serve as a nearly ideal model of a one-dimensional ferromagnetically coupled spin chain. – Ashot Melikyan


Subject Areas

MagnetismNanophysics

Related Articles

Quasisymmetric Stellarators
Magnetism

Quasisymmetric Stellarators

Magnetic-field configurations that improve confinement of fusion plasmas in stellarators can be achieved more precisely than previously thought, according to a numerical study. Read More »

1D Random-Field Ising Model Experimentally Realized
Complex Systems

1D Random-Field Ising Model Experimentally Realized

Researchers accurately replicate the predictions of the 1D random-field Ising model in an artificial spin ice. Read More »

Spin Mixing in Ferromagnets Revealed
Magnetism

Spin Mixing in Ferromagnets Revealed

Experiments with thin magnetic films show that mixing between spin states has a larger than expected effect on spectroscopic measurements used to probe magnetic interactions in materials. Read More »

More Articles