Frequency-domain magnetic resonance spectroscopy of molecular magnetic materials

Slageren, Joris van; Vongtragool, S.; Gorshunov, B.; Mukhin, A. A.; Karl, N.; Krzystek, J.; Telser, Joshua; Müller, Achim; Sangregorio, Claudio; Gatteschi, Dante; Dressel, Martin

doi:10.1039/b305328h

Cited by 97 publications

(79 citation statements)

References 27 publications

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“…It has also been used for the determination of anisotropic exchange interactions [15]. Finally, it can be operated in field and frequency domains [16]. However, the ultimate sensitivity of HFESR techniques, where the transmission or reflection of microwave photons is detected, is likely to be worse than a million spins.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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Abstract:The method of choice for in-depth investigation of the magnetic anisotropy in molecular nanomagnets is high-frequency electron spin resonance (HFESR) spectroscopy. It has the benefits of high resolution and facile access to large energy splittings. However, the sensitivity is limited to about 10 7 spins for a reasonable data acquisition time. In contrast, methods based on the measurement of the deflection of a cantilever were shown to enable single spin magnetic resonance sensitivity. In the area of molecular nanomagnets, the technique of torque detected electron spin resonance (TDESR) has been used sporadically. Here, we explore the applicability of that technique by investigating molecular nanomagnets with different types of magnetic anisotropy. We also assess different methods for the detection of the magnetic torque. We find that all types of samples are amenable to these studies, but that sensitivities do not yet rival those of HFESR.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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“…BWOs are used by several groups mainly focused on the study of molecular magnetism [46][47][48][49]. These oscillators combine a relatively high power with excellent frequency tuning possibilities.…”

Section: Backward Wave Oscillator (Bwo)mentioning

confidence: 99%

“…Brunel et al [43][44][45] realized a multifrequency HF-EPR spectrometer, which is optimized for the study of high-spin systems and radical species. Several laboratories followed similar schemes and developed multi-high-frequency instruments dedicated to a particular class of samples [46][47][48][49]. These setups do not need to be particularly sensitive and are less suited for work on diluted species and double resonance experiments.…”

Section: Introductionmentioning

confidence: 99%

High-Frequency EPR Instrumentation

Reijerse¹

2009

Appl Magn Reson

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An overview of the most recent developments in high-frequency highfield electron paramagnetic resonance (EPR) instrumentation is given. In particular, the practical choices concerning sources, detectors, resonators, propagation systems as well as magnet technology are discussed in the light of various possible applications. Examples of particular homodyne and heterodyne quasi-optic EPR systems illustrate the potential for future developments in EPR technology.

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“…24,25 This spectrometer was used for recording frequency-domain magnetic-resonance spectroscopy ͑FD-MRS͒ spectra, by sweeping the radiation frequency in zero applied field, as well as high-frequency ESR ͑HFESR͒ spectra, in which case it is the magnetic field that is swept at a fixed frequency / 2 = 300 GHz. FDMRS spectra were simulated with the use of a home-written program 26 while HFESR spectra were simulated with Weihe's simulation software.…”

Section: B Experimental Techniquesmentioning

confidence: 99%

Effect of crystalline disorder on quantum tunneling in the single-molecule magnetMn12benzoate

et al. 2010

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We report a detailed study of the effects that crystalline disorder has on the magnetic relaxation and quantum tunneling of Mn 12 benzoate clusters. Thanks to the absence of interstitial molecules in the crystal structure of this molecular compound, we have been able to isolate the influence of long-range crystalline disorder. For this, we compare results obtained under two extreme situations: a crystalline sample and a nearly amorphous material. The results show that crystalline disorder affects little the anisotropy, magnetic relaxation, and quantum tunneling of these materials. It follows that disorder is not a necessary ingredient for the existence of magnetic quantum tunneling. The results unveil, however, a subtle influence of crystallinity via the modification of the symmetry of dipole-dipole interactions. The faster tunneling rates measured for the amorphous material are accounted for by a narrower distribution of dipolar bias in this material, as compared with the crystalline sample.

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Frequency-domain magnetic resonance spectroscopy of molecular magnetic materials

Cited by 97 publications

References 27 publications

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

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

High-Frequency EPR Instrumentation

Effect of crystalline disorder on quantum tunneling in the single-molecule magnetMn12benzoate

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