Universität zu Köln

Grishunin, K., Mashkovich, E. A., Kimel, A., V, Balbashov, A. M. and Zvezdin, A. K. (2021). Excitation and detection of terahertz coherent spin waves in antiferromagnetic alpha-Fe2O3. Phys. Rev. B, 104 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

The efficiency of the ultrafast excitation of spins in antiferromagnetic alpha-Fe2O3 using a nearly single-cycle THz pulse is studied as a function of the polarization of the THz pulse and the sample temperature. Above the Morin point the most efficient excitation is achieved when the magnetic field of the THz pulse is perpendicular to the antiferromagnetically coupled spins. Using the experimental results and equations of motion for spins, we show that the mechanism of the spin excitation above and below the Morin point relies on a magnetic-dipole interaction of the THz magnetic field with spins, and the mechanism implies that the efficiency of the coupling is proportional to the time derivative of the magnetic field.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Grishunin, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mashkovich, E. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kimel, A., V UNSPECIFIED UNSPECIFIED UNSPECIFIED Balbashov, A. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zvezdin, A. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-588786
DOI:	10.1103/PhysRevB.104.024419
Journal or Publication Title:	Phys. Rev. B
Volume:	104
Number:	2
Date:	2021
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HEMATITE; ANISOTROPY; BIREFRINGENCE; RESONANCE Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58878