Method of making a transducer with improved inductive coupling
First Claim
1. A method of making at thin film magnetic transducer in a plurality of layers, comprisingforming a yoke having a plurality of arms that extend generally along a longitudinal axis of said transducer, at least one of said arms having a plurality of segments disposed in separate ones of said layers,connecting said plurality of segments through a transition layer, andforming a plurality of coils longitudinally spaced along said axis and electrically connected together in series, each one of said coils having at least one turn, said yoke and said coil being intertwined to provide at least two flux interactions between said yoke and said at least one turn of each one of said coils.
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Accused Products
Abstract
A thin film magnetic transducer formed in multiple layers and comprising a yoke having a plurality of arms, at least one of which has segments lying in separate layers and connected through a transition layer, and a multiturn coil intertwined with the yoke to provide at least two flux interactions between the yoke and coil. The transducer is constructed to enhance flux conduction by rotation and minimize flux conduction by wall motion in the yoke.
34 Citations
44 Claims
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1. A method of making at thin film magnetic transducer in a plurality of layers, comprising
forming a yoke having a plurality of arms that extend generally along a longitudinal axis of said transducer, at least one of said arms having a plurality of segments disposed in separate ones of said layers, connecting said plurality of segments through a transition layer, and forming a plurality of coils longitudinally spaced along said axis and electrically connected together in series, each one of said coils having at least one turn, said yoke and said coil being intertwined to provide at least two flux interactions between said yoke and said at least one turn of each one of said coils.
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9. A method of making at thin film magnetic transducer, comprising
forming a yoke having a plurality of planar pole pieces each of which includes a tip at a proximal end of said transducer and an arm that extends distally from said tip generally in a longitudinal direction, said tips of said pole pieces being laterally aligned and at least one of said arms of said pole pieces being configured to be laterally spaced from another one of said arms over a majority of the lengths of said arms in a direction generally parallel to the planes of said pole pieces, forming a portion of said yoke to extend generally transverse to said longitudinal direction in a direction generally parallel to the planes of said pole pieces at a distal end of said transducer, and connecting said one of said arms to another one of said arms with said portion, said portion being short relative to said lengths of said arms, providing each one of said arms with an easy axis of magnetization oriented transverse to said longitudinal direction so that flux will conduct through said arms predominantly by rotation rather than by wall motion, and forming a coil having at least one turn, said yoke and said coil being intertwined to provide at least two flux interactions between said yoke and said at least one turn.
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15. A method of making at thin film magnetic transducer, comprising
forming a yoke having a plurality of planar arms extending generally along a first direction and laterally spaced from each other over a majority of their lengths in a direction generally parallel to the planes of said arms, connecting said arms together by a portion extending generally transverse to said first direction in a direction generally parallel to said planes and which is short relative to said lengths of said arms, said arms each having an easy axis of magnetization oriented transverse to said first direction so that flux will conduct through said arms predominantly by rotation rather than by wall motion, providing at least said transverse portion of said yoke with a plurality of layers having different easy axes of magnetization at least one of which is transverse to the direction of flux conduction in said portion to reduce the amount of flux conduction that occurs by wall motion therein, and forming a coil having at least one turn, said yoke and said coil being intertwined to provide at least two flux interactions between said yoke and said at least one turn.
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19. A method of making a thin film magnetic transducer, comprising
forming a yoke having a plurality of arms each of which has at least one easy axis of magnetization, and forming a coil having at least one turn, said yoke and said coil being intertwined to provide at least two flux interactions between said yoke and said at least one turn, wherein said step of forming said yoke includes providing at least one of said arms with elongated segments each of which is disposed generally along a longitudinal axis of said transducer and has an easy axis of magnetization oriented transverse to the direction of flux conduction through said segment and at an oblique angle with respect to said longitudinal axis, and joining one of said segments to another one of said segments so that magnetic flux conducted by said segments is directed through said coil.
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25. A method of making a thin film magnetic transducer, comprising
forming a yoke having a plurality of arms, at least one of which includes a plurality of segments, some of said segments extending for flux flow along a first direction, others of said segments extending for flux flow along a direction oblique to said first direction, providing at least one of said oblique segments with laminated sub-layers, said laminated sub-layers having easy axes of magnetization that have different orientations, each of said easy axes being arranged at an oblique angle to said direction, and forming a coil having at least one turn, said yoke and said coil being intertwined to provide at least two flux interactions between said yoke and said at least one turn.
Specification