Transducer with improved inductive coupling
First Claim
1. A thin film magnetic transducer formed in a plurality of layers and comprisinga yoke having a plurality of arms extending 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, said plurality of segments being connected through a transition layer, anda plurality of coils spaced longitudinally along said axis and electrically connected together in series, each one of said coils having at least one turn, said yoke and said coils 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.
40 Citations
43 Claims
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1. A thin film magnetic transducer formed in a plurality of layers and comprising
a yoke having a plurality of arms extending 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, said plurality of segments being connected through a transition layer, and a plurality of coils spaced longitudinally along said axis and electrically connected together in series, each one of said coils having at least one turn, said yoke and said coils 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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10. A thin film magnetic transducer comprising
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 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, said yoke also including a portion extending generally transverse to said longitudinal direction in a direction generally parallel to the planes of said pole pieces for connecting said one of said arms to another one of said arms at a distal end of said transducer, said portion being short relative to said lengths of said arms, said arms each having 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 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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16. A thin film magnetic transducer comprising
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, said arms being connected together by a portion extending 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, at least said transverse portion of said yoke including 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 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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22. A thin film magnetic transducer comprising
a yoke having a plurality of arms each of which has at least one easy axis of magnetization, and 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, at least one of said arms having 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, one of said segments being joined to another one of said segments to direct flux through said coil.
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25. A thin film magnetic transducer comprising
a yoke having a plurality of arms each of which has at least one easy axis of magnetization, and 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, at least one of said arms having 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, one of said segments being joined to another one of said segments to direct flux through said coil, said segments being disposed oblique to each other, and the easy axis of each one of said segments being perpendicular to a direction along which said segment generally extends.
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26. A thin film magnetic transducer comprising
a yoke having a plurality of arms each of which has at least one easy axis of magnetization, and 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, each one of said plurality of arms having elongated segments disposed oblique to each other, each of said segments of each of said arms being disposed generally along a longitudinally axis of said transducer and having an easy axis of magnetization oriented transverse to the direction of flux flow through said segment and at an oblique angle with respect to said longitudinal axis, said segments being joined together to direct flux through said coil.
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28. A thin film magnetic transducer formed in a plurality of layers and comprising
a yoke having a plurality of arms, at least one of said arms having a plurality of segments disposed in separate ones of said layers, said plurality of segments being connected through a transition layer, at least one of said arms including a first portion adapted to be disposed adjacent to a storage medium and transfer flux between said arm and said medium, and a second portion that has a large surface area relative to a surface area of said first portion to cause flux in said arm to radiate from said second portion to regions adjacent to said transducer and then to another one of said arms, and 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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29. A thin film magnetic transducer comprising
a yoke having a plurality of arms extending generally along a first direction and connected by a portion that is short relative to lengths of said arms and that extends generally transverse to said first direction, 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, at least one of said arms including a first portion adapted to be disposed adjacent to a storage medium and transfer flux between said arm and said medium, and a second portion that has a large surface area relative to a surface area of said first portion to cause flux in said arm to radiate from said second portion to regions adjacent to said transducer and then to another one of said arms, and 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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30. A thin film magnetic transducer comprising
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 transverse to said first direction, at least one of said segments having laminated sublayers, said laminated sub-layers having easy axes of magnetization that have different orientations, and 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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42. A thin film magnetic transducer comprising
a yoke having a plurality of arms each of which has at least one easy axis of magnetization, and 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, at least one of said arms having elongated segments oblique to each other and having easy axes of magnetization respectively transverse to the directions of flux conduction through said segments, one of said oblique segments being joined to another of said arms so that flux can pass between said arms without flowing parallel to the easy axis of either said segment or said other arm, at least one of said arms including a first portion adapted to be disposed adjacent to a storage medium and transfer flux between said arm and said medium, and a second portion that has a large surface area relative to a surface area of said first portion to cause flux in said arm to radiate from said second portion to regions adjacent to said transducer and then to another one of said arms.
Specification