New Directions in Electron Paramagnetic Resonance Spectroscopy on Molecular Nanomagnets

Abstract

Recent developments and results in the area of electron paramagnetic resonance (EPR) in molecular nanomagnetism are reviewed. Emphasis is placed on unconventional measurement methods, such as frequency-domain magnetic resonance spectroscopy, interferometer-based Fourier-transform, terahertz spectroscopy, and terahertz time-domain spectroscopy. In addition, different methods to investigate EPR by monitoring the change in magnetization or magnetic torque in the presence of microwave radiation are discussed. Finally, an overview is given of application of pulse EPR in investigations of molecular nanomagnets.

Torque-Detected Electron Spin Resonance as a Tool to Investigate Magnetic Anisotropy in Molecular Nanomagnets

“…With the drive of the field to investigate (sub)monolayers of MNMs for applications in spintronic devices [17,18] this sensitivity is not sufficient. Alternative electron spin resonance (ESR) detection methods include those where the change in magnetization due to magnetic resonance is measured by superconducting interference device (SQUID) or Hall bar sensors [19]. Some of us as well as others have developed the technique of torque-detected electron spin resonance (TDESR) spectroscopy for the investigation of molecular nanomagnets [20][21][22].…”

Room temperature quantum coherence in a potential molecular qubit

“…Molecular surface self-assembly techniques have reached the stage where the size of the ordered array is essentially determined by the size of the atomically flat plateaus of the substrate 7 . Surprisingly little has been published on quantum coherence times in mononuclear and polynuclear transition metal complexes 8,9 . In recent years, especially the quantum coherence in exchange coupled molecular nanomagnets (MNMs) has received much attention 8,[10][11][12][13][14][15][16][17][18][19][20][21][22] .…”

Terminological confusions and problems at the interface between the crystal field Hamiltonians and the zero-field splitting Hamiltonians—Survey of the CF=ZFS confusion in recent literature

“…However, the prevailing trend in SMM (MNM) literature is to denote the total spin as S, especially if the constituent single-ion spins are not discussed, as, e.g. in the review [121]. Sometimes the small and capital letters are used for the parameters, which in fact represent the ZFSPs but, as discussed later, are often incorrectly named as the CFPs.…”