YIG detection - DC Magnetic Field
I would like to use a Yttrium Iron Garnet crystal in order to set off an alarm when a "YIG tagged" item (such as a box or package) passes through a portal. I've read that YIGs resonate at microwave frequencies when passed through a DC magnetic field. Is is practical/possible to create the field to be 6 feet (or more) in diameter? Obviously, I'm not an engineer. Thanks for the help in advance!
YIG is a very expensive single crystal. Yes the sphere would resonate but to "see" it at 6 feet would probably require gain (dc power, cost, etc.). I guess cost in quantity >~$40.
I'm using Hall-effect devices, very cheap, to detect the locomotives which have little magnets glued underneath on my model railway.
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