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A sterilization system having a controllable non-ironismg microwave radiation source for providing microwave energy for combining with a gas to produce atmospheric low temperature plasma for sterilizing biological tissue surfaces or the like. A plasma generating region may be contained in a hand held plasma applicator. The system may include an impedance adjustor e.g. integrated in the plasma applicator arranged to set a plasma strike condition and plasma sustain condition. The gas and microwave energy may be transported to a plasma generating region along an integrated cable assembly. The integrated cable assembly may provide a two way gas flow arrangement to permit residual gas to be removed from the surface. Invasive surface plasma treatment is therefore possible. The plasma applicator may have multiple plasma emitters to produce a line or blanket of plasma.

A magnetic head includes first and second coils, a main pole, a first shield, and first and second return path sections. The first shield and the first return path section are located forward of the main pole in the direction of travel of the recording medium. The first return path section connects the main pole and the first shield so that a first space is defined. The second return path section is located backward of the main pole in the direction of travel of the recording medium so that a second space is defined. The first coil includes at least one first coil element passing through the first space. The second coil includes a plurality of second coil elements passing through the second space. The at least one first coil element is smaller in number than the second coil elements.