Observation of Intrinsic Low Temperature Magneto-Mechanic Effects in Crystalline Resonant Phonon Cavities due to Ordered Ferromagnetic Phase
作者： Maxim Goryachev , Serge Galliou , Michael E. Tobar
DOI: 10.1103/PHYSREVB.100.174108
关键词: Hysteresis 、 Spin-½ 、 Magnetic field 、 Coupling (physics) 、 Phonon 、 Materials science 、 Resonator 、 Ferromagnetism 、 Resonance 、 Condensed matter physics
摘要: We observe intrinsic magnetic effects in ultra-high quality factor crystalline quartz Bulk Acoustic Wave resonators at milli-Kelvin temperature. The study reveals existence of hysteresis loops, jumps and memory acoustical resonance frequencies. These loops arise as a response to the external field span over few Hertz range for modes with linewidths less than $100$mHz. are broadband but get stronger towards higher frequencies where both nonlinear losses limited by two level systems. This suggests that observed due an ordered ferromagnetic phase spin ensemble coupled mechanical modes. coupling between degrees freedom ultra low loss regime brings new possibilities emerging class quantum hybrid
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