scholarly journals Longitudinal and transverse electron paramagnetic resonance in a scanning tunneling microscope

2020 ◽  
Vol 6 (40) ◽  
pp. eabc5511
Author(s):  
Tom S. Seifert ◽  
Stepan Kovarik ◽  
Dominik M. Juraschek ◽  
Nicola A. Spaldin ◽  
Pietro Gambardella ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Paramagnetic Resonance ◽  
Scanning Tunneling ◽  
Coupling Mechanism ◽  
Paramagnetic Resonance ◽  
Widespread Application ◽  
Field Gradients ◽  
Magnetic Field Gradients ◽  
Piezoelectric Coupling ◽  
Electron Paramagnetic

Electron paramagnetic resonance (EPR) spectroscopy is widely used to characterize paramagnetic complexes. Recently, EPR combined with scanning tunneling microscopy (STM) achieved single-spin sensitivity with sub-angstrom spatial resolution. The excitation mechanism of EPR in STM, however, is broadly debated, raising concerns about widespread application of this technique. We present an extensive experimental study and modeling of EPR-STM of Fe and hydrogenated Ti atoms on a MgO surface. Our results support a piezoelectric coupling mechanism, in which the EPR species oscillate adiabatically in the inhomogeneous magnetic field of the STM tip. An analysis based on Bloch equations combined with atomic-multiplet calculations identifies different EPR driving forces. Specifically, transverse magnetic field gradients drive the spin-1/2 hydrogenated Ti, whereas longitudinal magnetic field gradients drive the spin-2 Fe. Also, our results highlight the potential of piezoelectric coupling to induce electric dipole moments, thereby broadening the scope of EPR-STM to nonpolar species and nonlinear excitation schemes.

Electron paramagnetic resonance magnetic field sensors for particle accelerators

2020 ◽  
Vol 91 (10) ◽  
pp. 105001
Author(s):  
Anthony Beaumont ◽  
David Giloteaux ◽  
Alessandro V. Matheoud ◽  
Marco Buzio ◽  
Giovanni Boero
Keyword(s):  
Magnetic Field ◽  
Electron Paramagnetic Resonance ◽  
Particle Accelerators ◽  
Paramagnetic Resonance ◽  
Magnetic Field Sensors ◽  
Electron Paramagnetic ◽  
Resonance Magnetic Field

scholarly journals MICROWAVE MAGNETOPLASMON ABSORPTION BY A 2DEG STRIPE

2009 ◽  
Vol 23 (12n13) ◽  
pp. 2698-2702 ◽  
Author(s):  
O. M. FEDORYCH ◽  
S. A. STUDENIKIN ◽  
S. MOREAU ◽  
M. POTEMSKI ◽  
T. SAKU ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Paramagnetic Resonance ◽  
Absorption Spectra ◽  
Electron Concentration ◽  
Carrier Density ◽  
High Mobility ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

Microwave (MW) absorption by a high mobility 2DEG has been investigated experimentally using sensitive Electron Paramagnetic Resonance (EPR) cavity technique. It is found that MW absorption spectra are chiefly governed by confined magnetoplasmon excitations in a 2DEG stripe. Spectra of the 2D magnetoplasmons are studied as a function of magnetic field, MW frequency and carrier density. The electron concentration is tuned by illumination and monitored using optical photoluminescence technique.

The Electron Paramagnetic Resonance Spectrum of γ-Irradiated Dimethyl Malonic Acid

2004 ◽  
Vol 59 (1-2) ◽  
pp. 103-104 ◽  
Author(s):  
Biray Aşik ◽  
Mehmet Birey
Keyword(s):  
Magnetic Field ◽  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectrum ◽  
Single Crystals ◽  
Malonic Acid ◽  
Hyperfine Coupling ◽  
Resonance Spectrum ◽  
Coupling Constants ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

The electron paramagnetic resonance of γ -Irradiated single crystals of dimethyl malonic acid [(CH3)2C(COOH)2] has been studied for different orientations of the crystal in a magnetic field. The radicals produced by gamma irradiation have been investigated between 123 and 300 K. The spectra were found to be temperature independent, and radiation damage centres were attributed to [(CH3)2C(COOH)2]+ radicals. The g factor and hyperfine coupling constants were found to be almost isotropic with average values g = 2.0036, a(COOH)2 = 0.5 mT, a(CH3)2 = 2.1 mT, respectively, and spin density ρ = 91% of the [(CH3)2C(COOH)2]+ radical.

Sign in / Sign up

Export Citation Format

Share Document