Finite-sized Heisenberg chains and magnetism of one-dimensional metal systems |
| |
Authors: | A Vindigni A Rettori MG Pini C Carbone P Gambardella |
| |
Institution: | (1) Dipartimento di Fisica and INFM, Università di Firenze, 50019 Sesto Fiorentino, Italy;(2) Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, 50019 Sesto Fiorentino, Italy;(3) Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34012 Trieste, Italy;(4) Institut de Physique des Nanostructures, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland |
| |
Abstract: | We present a combined experimental and theoretical study of the magnetization of one-dimensional atomic cobalt chains deposited
on a platinum surface. We discuss the intrinsic magnetization parameters derived by X-ray magnetic circular dichroism measurements
and the observation of ferromagnetic order in one dimension in connection with the presence of strong, dimensionality-dependent
anisotropy energy barriers of magnetocrystalline origin. An explicit transfer matrix formalism is developed to treat atomic
chains of finite length within the anisotropic Heisenberg model. This model allows us to fit the experimental magnetization
curves of cobalt monatomic chains, measured parallel to the easy and hard axes, and provides values of the exchange coupling
parameter and the magnetic anisotropy energy consistent with those reported in the literature. The analysis of the spin–spin
correlation as a function of temperature provides further insight into the tendency to magnetic order in finite-sized one-dimensional
systems.
PACS 57.10.Pq; 75.30.-m; 75.30.Gw; 78.70.Dm |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|