Magnetically tuning the loss tangent in La(Al1−xFex)O3 using low field electron paramagnetic resonance transitions

2020 ◽  
Vol 117 (22) ◽  
pp. 222901
Author(s):  
Justin Gonzales ◽  
Siddhesh Gajare ◽  
Sophie Nguyen ◽  
Alicia Wu ◽  
Nathan Newman
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Loss Tangent ◽  
Paramagnetic Resonance ◽  
Low Field ◽  
Field Electron ◽  
Resonance Transitions ◽  
Electron Paramagnetic

Radiofrequency polarization effects in low-field electron paramagnetic resonance

2009 ◽  
Vol 11 (31) ◽  
pp. 6573 ◽  
Author(s):  
C. J. Wedge ◽  
Christopher T. Rodgers ◽  
Stuart A. Norman ◽  
Neville Baker ◽  
Kiminori Maeda ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Paramagnetic Resonance ◽  
Polarization Effects ◽  
Low Field ◽  
Field Electron ◽  
Electron Paramagnetic

SPACE-CHARGE LAYER, INTRINSIC "BULK" AND SURFACE COMPLEX DEFECTS IN ZnO NANOPARTICLES — A HIGH-FIELD ELECTRON PARAMAGNETIC RESONANCE ANALYSIS

2013 ◽  
Vol 06 (04) ◽  
pp. 1330004 ◽  
Author(s):  
RÜDIGER-A. EICHEL ◽  
EMRE ERDEM ◽  
PETER JAKES ◽  
ANDREW OZAROWSKI ◽  
JOHAN VAN TOL ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Space Charge ◽  
Zno Nanoparticles ◽  
High Field ◽  
Space Charge Layer ◽  
Paramagnetic Resonance ◽  
Charge Layer ◽  
Type Formula ◽  
Field Electron ◽  
Electron Paramagnetic

The defect structure of ZnO nanoparticles is characterized by means of high-field electron paramagnetic resonance (EPR) spectroscopy. Different point and complex defects could be identified, located at the "bulk" or the surface region of the nanoparticles. In particular, by exploiting the enhanced g-value resolution at a Larmor frequency of 406.4 GHz, it could be shown that the resonance commonly observed at g = 1.96 is comprised of several overlapping resonances from different defects. Based on the high-field EPR analysis, the development of a space-charge layer could be monitored that consists of (shallow) donor-type [Formula: see text] defects at the "bulk" and acceptor-type [Formula: see text] and complex [Formula: see text] defects at the surface. Application of a core-shell model allows to determine the thickness of the depletion layer to 1.0 nm for the here studied compounds [J.J. Schneider et al., Chem. Mater.22, 2203 (2010)].

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