Spin canting in a Dy-based Single-Chain Magnet with dominant next-nearest neighbor antiferromagnetic interactions

Abstract

We investigate theoretically and experimentally the static magnetic properties of single crystals of the molecular-based Single-Chain Magnet (SCM) of formula [Dy(hfac)${}_3$NIT(C${}_6$H${}_4$OPh)]${}_{\infty }$ comprising alternating Dy${}^{3+}$ and organic radicals. A peculiar inversion between maxima and minima in the angular dependence of the magnetic molar susceptibility ${\chi }_M$ occurs on increasing temperature. Using information regarding the monomeric building block as well as an {\it ab initio} estimation of the magnetic anisotropy of the Dy${}^{3+}$ ion, this anisotropy-inversion phenomenon can be assigned to weak one-dimensional ferromagnetism along the chain axis. This indicates that antiferromagnetic next-nearest-neighbor interactions between Dy${}^{3+}$ ions dominate, despite the large Dy-Dy separation, over the nearest-neighbor interactions between the radicals and the Dy${}^{3+}$ ions. Measurements of the field dependence of the magnetization, both along and perpendicularly to the chain, and of the angular dependence of ${\chi }_M$ in a strong magnetic field confirm such an interpretation. Transfer matrix simulations of the experimental measurements are performed using a classical one-dimensional spin model with antiferromagnetic Heisenberg exchange interaction and non-collinear uniaxial single-ion anisotropies favoring a canted antiferromagnetic spin arrangement, with a net magnetic moment along the chain axis. The fine agreement obtained with experimental data provides estimates of the Hamiltonian parameters, essential for further study of the dynamics of rare-earths based molecular chains.

11 pages, 8 figures

References in corpus (4)

• Glauber dynamics in a single-chain magnet: From theory to real systems
• Finite-Size effects in "Single Chain Magnets": an experimental and theoretical study
• Glauber slow dynamics of the magnetization in a molecular Ising chain
• Quantum nucleation in a single-chain magnet

Cited by in corpus (5)

• Static and dynamic properties of Single-Chain Magnets with sharp and broad domain walls
• Configuration-averaged 4f orbitals in ab initio calculations of low-lying crystal field levels in lanthanide(III) complexes
• Magnetic Tetrastability in a Spin Chain
• Selection rules for Single-Chain-Magnet behavior in non-collinear Ising systems
• Interplay between trimer structure and magnetic ground state in Ba5Ru3O12 probed by Neutron and muSR techniques