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Title: Evidence of dilute ferromagnetism in rare-earth doped yttrium aluminium garnet

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{sup 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.
Authors:
; ; ;  [1] ;  [2]
  1. ARC Centre of Excellence for Engineered Quantum Systems, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009 (Australia)
  2. Experimentalphysik, Universität des Saarlandes, D-66123 Saarbrücken (Germany)
Publication Date:
OSTI Identifier:
22482127
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM OXIDES; CRYSTALS; DIELECTRIC MATERIALS; DOPED MATERIALS; ERBIUM IONS; FERRITE GARNETS; FERROMAGNETISM; IMPURITIES; MAGNETIC FIELDS; MHZ RANGE 100-1000; MICROWAVE RADIATION; PARAMAGNETISM; PHASE TRANSFORMATIONS; QUALITY FACTOR; RARE EARTHS; SEMICONDUCTOR MATERIALS; TEMPERATURE DEPENDENCE; YTTRIUM COMPOUNDS