Title

Magnetic And Microwave Studies Of High-Spin States Of Single-Molecule Magnet Ni 4

Keywords

Electron paramagnetic resonance; Magnetometry; Nanomagnet; Quantum computing; Quantum tunneling of magnetization; Single-molecule magnet; Superparamagnet

Abstract

Quantum tunneling of the magnetization in a single-molecule magnet has been studied in experiments that combine microwave spectroscopy (10-50 GHz) with low temperature high sensitivity micro-Hall effect magnetometry (T = 0.4 K). This method enables the monitoring of spin-state populations in the presence of microwave radiation and a direct measure of the energy splitting between low lying high-spin states. We present results that show the level repulsion between such states as a function of magnetic field in the SMM Ni 4 (S = 4), which clearly indicates the formation of high-spin superposition states. The absorption linewidths provide a lower bound on the transverse relaxation time (τ 2) or decoherence time of these superposition states of ∼0.5 ns. Studies as a function of microwave power and magnetic field sweep rate suggest that the energy relaxation rate decreases with increasing longitudinal field and energy splitting between states. © 2005 Elsevier Ltd. All rights reserved.

Publication Date

11-17-2005

Publication Title

Polyhedron

Volume

24

Issue

16-17

Number of Pages

2695-2700

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.poly.2005.03.137

Socpus ID

27644510909 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/27644510909

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