Evidence of Dilute Ferromagnetism in Rare-Earth doped YAG

Abstract

This work demonstrates strong coupling regime between an Erbium ion spin ensemble and microwave Hybrid Cavity-Whispering Gallery Modes in a Yttrium Aluminium Garnet dielectric crystal. Coupling strengths of $220$~MHz and mode quality factors in excess of $10^6$ are demonstrated. Moreover, the magnetic response of high-Q modes demonstrates behaviour which is unusual for paramagnetic systems. This behaviour includes hysteresis and memory effects. Such qualitative change of the system's magnetic field response is interpreted as a phase transition of Rare Earth ion impurities. This phenomenon is similar to the phenomenon of dilute ferromagnetism in semiconductors. The clear temperature dependence of the phenomenon is demonstrated.

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Cited by in corpus (9)

• Ultra-High Cooperativity Interactions between Magnons and Resonant Photons in a YIG sphere
• Experimental Implementations of Cavity-Magnon Systems: from Ultra Strong Coupling to Applications in Precision Measurement
• High precision measurement of the Dzyaloshinsky-Moriya interaction between two rare-earth ions in a solid
• High-cooperativity coupling of a rare-earth spin ensemble to a superconducting resonator using yttrium orthosilicate as a substrate
• Compositional nanodomain formation in hybrid formate perovskites
• Determination of Low Loss in Isotopically Pure Single Crystal ${}^{28}$Si at Low Temperatures and Single Microwave Photon Energy
• Indirect Methods to Control Population Distribution in a Large Spin System
• Observation of Low Temperature Magneto-Mechanic Effects in Crystalline Resonant Phonon Cavities
• Electromagnetic properties of terbium gallium garnet at millikelvin temperatures and single photon energy