Electron device

An electron device including a laminated film and a covering film,

• said laminated film including a first lays a second layer and a third layer,
• said first layer formed of a metal or metal alloy,
• said third layer formed of a metal or metal alloy different from the metal or metal alloy of said first layer,
• said second layer arranged between said first and third layers and formed of a mixture of a metal or metal alloy of the first layer and a metal or metal alloys of the third layer, and
• said covering film covering end faces of said first, second and third layers.

A thin film magnetic head including a slider, a magnetic converting element and a covering film,

• said slider having a medium-facing surface,
• said magnetic converting clement including a magnetoresistive effective element and mounted on said slider with its end face being on said medium-facing surface of said slider,
• said magnetoresistive effective element including an active region and a passive region,
• said passive region connected to said active region,
• at least one of said passive and active regions including a laminated film,
• said laminated film including a first layer and a second layer,
• said first layer formed of a metal or metal alloy with its end face being on said medium-facing surface of said slider,
• said second layer formed of a metal or metal alloy different from that of the first layer and adjoining said first layer with its end face of being on said medium-facing surface of said slider, and
• further including in a region adjoining said first and second layers a concentration gradient layer containing a metal or metal alloy contained in said first layer and a metal or metal alloy contained in said second layer;
• and
• said covering film being attached to said medium-facing surface of said slider and covering the end faces of said first and second layers.

A thin film magnetic head including a slider, a magnetic converting element and a covering film,

• said slider having a medium-facing surface,
• said magnetic converting element including a magnetoresistive effective element and mounted on said slider with its end face being on said medium-facing surface of said slider,
• said magnetoresistive effective element including an active region and a passive region,
• said passive region connected to said active region,
• at least one of said passive and active regions including a laminated film,
• said laminated film including a first layer, a second layer and a third layer,
• said first layer formed of a metal or metal alloy,
• said third layer formed of a metal or metal alloy different from that of said fist layer,
• said second layer arranged between said first and third layers and formed of a mixture of a metal or metal alloy contained in said first layer and a metal or metal alloy contained in said third layer, and
• said covering film covering end faces of said first, second and third layers.