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An electron spin resonance system comprising a magnetic circuit in which a pair of permanent magnets are respectively attached to opposing surfaces of a pair of stationary yokes arranged opposite to each other by way of a gap, a movable yoke is disposed to at least one of the pair of the stationary

An electron spin resonance system comprising a magnetic circuit in which a pair of permanent magnets are respectively attached to opposing surfaces of a pair of stationary yokes arranged opposite to each other by way of a gap, a movable yoke is disposed to at least one of the pair of the stationary yokes for continuously changing the distance between opposing surfaces of the stationary yokes, so that the magnetic resistance of a magnetic path formed by the permanent magnets, stationary yokes and movable yokes is varied continuously thereby forming a continuously varying magnetic field in the gap between the opposed permanent magnets, and a modulating magnetic field application coil for applying a modulating magnetic field and/or a sweeping magnetic field application coil for applying a sweeping magnetic field to the gap, a cavity resonator disposed in the gap in which a specimen to be measured can be inserted, and a microwave generator and a microwave detector disposed to the cavity resonator.

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An electron spin resonance system, comprising: a magnetic circuit in which each permanent magnet, including a magnetic pole piece on the surface thereof, of a pair of permanent magnets is respectively attached to an opposing surface of a stationary yoke of a pair of stationary yokes mounted opposite

An electron spin resonance system, comprising: a magnetic circuit in which each permanent magnet, including a magnetic pole piece on the surface thereof, of a pair of permanent magnets is respectively attached to an opposing surface of a stationary yoke of a pair of stationary yokes mounted opposite to each other to form a gap, a movable yoke mounted for continuously changing the distance between opposing surfaces of the stationary yokes, so that the magnetic resistance of a magnetic path formed by said permanent magnets, stationary yokes and movable yokes is continuously modulated, thereby forming a continuously modulated magnetic field in the gap between the opposed permanent magnets; coils for applying a modulating magnetic field to said gap and a sweeping magnetic field application coil for applying a sweeping magnetic field to said gap; a cavity resonator disposed in said gap for receiving specimens to be measured; and a microwave generator and a microwave detector attached to the outside of said cavity resonator.