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

Journal Article · Mon Sep 21 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4931432· OSTI ID:22482127

Farr, Warrick G.; Goryachev, Maxim; Le Floch, Jean-Michel; Tobar, Michael E. ^[1]; Bushev, Pavel ^[2]

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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)

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.

• OSTI ID: 22482127
• Journal Information: Applied Physics Letters, Vol. 107, Issue 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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