Abstract: A method of producing a magnetic film of Fe-Si-Al alloy in which argon is entrapped, by using a DC magnetron sputtering apparatus to apply RF bias to a substrate thereby depositing a Fe-Si-Al alloy film on the substrate. The alloy film produced has a thermal expansion coefficient of 110.times.10.sup.-7 to 170.times.10.sup.-7 .degree. C..sup.-1 and the substrate has a thermal expansion coefficient of 100.times.10.sup.-7 to 135.times.10.sup.-7 .degree. C..sup.-1. The amount of argon entrapped in the alloy film is controlled within the range of 0.01 o 0.3 weight percent so as to substantially zero the internal stresses in the alloy film.

Abstract: An exhaust particle cleaning device for a diesel engine includes a trap case provided in a flow conduit for the exhaust gas. A filter is disposed in the trap case so that carbon particles or other exhaust particles contained in the exhaust gas can be caught in the filter material when the exhaust gas is passed through the filter. A plurality of electric heating wires are spread over the upstream end face of the filter so that the exhaust gas passes through the areas defined between the plurality of heating wires. These heating wires are supported by insulator arms so as to maintain a predetermined small gap between the heating wires and the upstream end face of the filter.