Anisotropy, Geometric Structure and Frustration Effects in Molecule-Based Nanomagnets

• Authors: G. Kamieniarz , P. Kozłowski , M. Antkowiak , P. Sobczak , T. Ślusarski , D. Tomecka , A. Barasiński , B. Brzostowski , A. Drzewiński , A. Bieńko , J. Mroziński
• Languages of publication: EN

Abstracts

EN

In this paper we review our results of comprehensive study of molecular nanomagnets recently synthesized in the form of the chromium-based molecules and bimetallic copper-containing chains as well as we present some new findings. We focus on effects of anisotropy, geometry and frustration appearing in various thermodynamic properties of the nanoscale magnets which are described by Heisenberg-like spin models and simulated by accurate numerical methods. We show that bond-dependent exchange anisotropy is needed to model magnetic torque in the Cd-doped chromium ring. We argue that only in the limit of infinite rings (n → ∞) frustration can be considered as the opposite to bipartiteness in the odd numbered (3 ≤ n ≤ 9) s = 3/2 quantum spin rings. We analyse the influence of exchange interactions and anisotropy on magnetic susceptibility of bimetallic (S = 3/2, s = 1/2) chains composed of Cu ions linked to different 3d ions by fitting experimental data. We reach the remarkable consistency of the density functional theory estimates of the magnetic couplings in Cr_8 molecule and provide strong support to the spin models exploited in the literature.

Keywords

EN

75.50.Xx; 75.10.Jm; 75.10.Pq; 75.40.Cx

Discipline

• 75.10.Pq: Spin chain models
• 75.40.Cx: Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
• 75.10.Jm: Quantized spin models, including quantum spin frustration
• 75.50.Xx: Molecular magnets

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 5-6
• Pages: 992-998

Dates

published

2012-05

Contributors

author

G. Kamieniarz

• Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

P. Kozłowski

• Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

M. Antkowiak

• Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

P. Sobczak

• Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

T. Ślusarski

• Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

D. Tomecka

• Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

A. Barasiński

• Institute of Physics, University of Zielona Góra, Zielona Góra, Poland

author

B. Brzostowski

• Institute of Physics, University of Zielona Góra, Zielona Góra, Poland

author

A. Drzewiński

• Institute of Physics, University of Zielona Góra, Zielona Góra, Poland

author

A. Bieńko

• Faculty of Chemistry, University of Wrocław, Wrocław, Poland

author

J. Mroziński

• Faculty of Chemistry, University of Wrocław, Wrocław, Poland

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Identifiers

DOI

10.12693/APhysPolA.121.992