Title :
Novel bulk iron garnets for magneto-optic magnetic field sensing
Author :
Deeter, M.N. ; Bon, S. Milián ; Day, G.W. ; Diercks, G. ; Samuelson, S.
Author_Institution :
Div. of Electromagn. Technol., Nat. Inst. of Stand. & Technol., Boulder, CO, USA
fDate :
11/1/1994 12:00:00 AM
Abstract :
We report measurements of the magneto-optic response function and frequency response for three bulk iron garnet crystals grown by a flux technique. The samples were the product of an intensive effort to develop iron garnet compositions with properties specifically optimized for magnetic field sensing. Sensitivity enhancement was achieved through both bismuth substitution (for increasing the saturation Faraday rotation) and gallium substitution (for reducing the saturation magnetization). One sample exhibited a value of magneto-optic sensitivity of 25°/mT for 1.3 μm light. Frequency response measurements indicate that bismuth substitution actually improves performance (compared to unsubstituted yttrium iron garnet) in contrast with gallium, which causes substantial degradation
Keywords :
Faraday effect; bismuth compounds; gallium compounds; garnets; magnetic field measurement; magnetisation; magneto-optical sensors; yttrium compounds; 1.3 mum; YFe5O12Ga5O12; YIGGG; bismuth substitution; bulk iron garnets; flux technique; frequency response; gallium substitution; garnet crystals; magneto-optic magnetic field sensing; magneto-optic response function; magneto-optic sensitivity; saturation Faraday rotation; saturation magnetization; yttrium iron garnet; Bismuth; Crystals; Frequency measurement; Frequency response; Garnets; Iron; Magnetic field measurement; Magnetic fields; Magnetic properties; Saturation magnetization;
Journal_Title :
Magnetics, IEEE Transactions on
