Abstract
Optical control of the spin degree of freedom is often desired in application of the spin technology. Here we report spin-rotational excitations observed through inelastic light scattering of the hexagonal LuMnO3 in the antiferromagnetically (AFM) ordered state. We propose a model based on the spin–spin interaction Hamiltonian associated with the spin rotation of the Mn ions, and find that the spin rotations are angularly quantized by 60°, 120°, and 180°. Angular quantization is considered to be a consequence of the symmetry of the triangular lattice of the Mn-ion plane in the hexagonal LuMnO3. These angularly-quantized spin excitations may be pictured as isolated flat bubbles in the sea of the ground state, which may lead to high-density information storage if applied to spin devices. Optically pumped and detected spin-excitation bubbles would bring about the advanced technology of optical control of the spin degree of freedom in multiferroic materials.
Highlights
Optical control of the spin degree of freedom is often desired in application of the spin technology
We propose a model associated with the spin rotation of the Mn ions in the symmetry of the triangular lattice with the AFM ordering
The peak at 805 cm−1 may be considered as the spin-flip excitation energy for the M n3+ ions in one triangle of the lattice in LuMnO3 just as the 760 cm−1 peak in HoMnO3 is claimed to be due to the spin-flip excitation[28]
Summary
Optical control of the spin degree of freedom is often desired in application of the spin technology. Angular quantization is considered to be a consequence of the symmetry of the triangular lattice of the Mn-ion plane in the hexagonal LuMnO3 These angularly-quantized spin excitations may be pictured as isolated flat bubbles in the sea of the ground state, which may lead to high-density information storage if applied to spin devices. Magnetic technologies have been actively explored in various fields to overcome the practical issues with the RMnO3 (R = rare earths, Y, and Sc) which are well known materials possessing ferroelectric and antiferromagnetic (AFM) transitions simultaneously This binary character has been investigated by several optical and magnetic techniques as well as theoretical studies because of its immense potential for. When a proper energy is supplied to the system, one of the electrons in dx2−y2/dxy levels The Mn3+-ions are placed at x c=an13bpeoesxitciiotnedotfoththe etrdia3nz2g−url2alrelvaetlt,iccealilneda
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