Phys.org August 16, 2023
Spin waves are ideal candidates for wave-based computing, but the construction of magnetic circuits is blocked by the lack of an efficient mechanism to excite long-running exchange spin waves with normalized amplitudes. An international team of researchers (Austria, Ukraine, Germany, Czech Republic) solved the problem by exploiting a deeply nonlinear phenomenon for forward volume spin waves in 200-nm-wide nanoscale waveguides and validated their concept using microfocused Brillouin light scattering spectroscopy. An unprecedented nonlinear frequency shift of more than 2 GHz was achieved, corresponding to a magnetization precession angle of 55° and enabled the excitation of spin waves with wavelengths down to 200 nm. The amplitude of the excited spin waves was constant and independent of the input microwave power due to the self-locking nonlinear shift, enabling robust adjustment of the spin-wave amplitudes in future on-chip magnonic integrated circuits… read more. Open Access TECHNICAL ARTICLEÂ
Schematic picture of exchange spin-wave excitation. Credit: SCIENCE ADVANCES, 11 Aug 2023, Vol 9Â