Journal
PHYSICAL REVIEW B
Volume 87, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.094414
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Funding
- European Commission [228673]
- EPSRC of the UK [EP/E055087/1]
- EPSRC [EP/E055087/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E055087/1] Funding Source: researchfish
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We report an experimental observation of high frequency magnetic excitations in terbium gallium garnet crystals using terahertz time-domain spectroscopy. We show that precessional modes of terbium magnetic sublattices can be excited by a magnetic field of a terahertz broadband pulse. We study and discuss the dependence of the observed resonances upon the temperature and the strength and orientation of the bias magnetic field. The behavior of the observed magnetic modes is in agreement with the theory of paramagnetic resonance in the multisublattice system. We also show that the illumination of the crystal with intense optical pulses destroys the magnetic ordering. Our results demonstrate that the time-domain terahertz spectroscopy can be a powerful tool by which to study high frequency properties of dielectric magnetic materials, with perceived extensions to studies in femtomagnetism and magnonics. DOI: 10.1103/PhysRevB.87.094414
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