Magnetic element with improved field response and fabricating method thereof
AssigneeMotorola, Inc.
InventorsEugene Youjun Chen, Jon Michael Slaughter, Jing Shi
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Abstract
An improved and novel fabrication method for a magnetic element, and more particularly a magnetic element (10) including a first electrode (14), a second electrode (18) and a spacer layer (16). The first electrode (14) includes a fixed ferromagnetic layer (26) having a thickness t1. A second electrode (18) is included and comprises a free ferromagnetic layer (28) having a thickness t2. A spacer layer (16) is located between the fixed ferromagnetic layer (26) and the free ferromagnetic (28) layer, the spacer layer (16) having a thickness t3, where 0.25t3<t1<2t3, thereby producing near zero magnetic field at the free ferromagnetic layer (28).
Claims18
A magnetic element comprising:
- a first electrode comprising a fixed ferromagnetic layer having a top surface and a bottom surface whose magnetization is fixed in a preferred direction in the presence of an applied magnetic field, the fixed ferromagnetic layer having a thickness t1;
- a second electrode comprising a free ferromagnetic layer having a surface whose magnetization is free to rotate in the presence of an applied magnetic field, the free ferromagnetic layer having a thickness t2;
- a spacer layer located between the fixed ferromagnetic layer of the first electrode and the free ferromagnetic layer of the second electrode, the spacer layer having a thickness t3;
- wherein t1 is chosen such that the magnetic fields produced by the topology of the top surface and the bottom surface of the fixed ferromagnetic layer cancel to produce near zero coupling energy between the free ferromagnetic layer and the fixed magnetic layer;
- and
- a substrate, the first and second electrodes, and the spacer layer, being formed on the substrate.
A magnetic element comprising:
- a fixed ferromagnetic layer including a top surface and a bottom surface whose magnetic moment is fixed in a preferred direction in the presence of an applied magnetic field, the fixed ferromagnetic layer having a thickness of t1;
- a free ferromagnetic layer whose magnetic moment is oriented generally perpendicular to the moment of the magnetic field and is free to rotate away from said perpendicular orientation in the presence of an applied magnetic field, the free ferromagnetic layer having a thickness of t2;
- and
- a spacer layer located between the fixed ferromagnetic layer and the free ferromagnetic, the spacer layer having a thickness of t3;
- wherein t1 is chosen such that the magnetic fields produced by the topology of the top surface and the bottom surface of the fixed ferromagnetic layer cancel to produce near zero coupling energy between the free ferromagnetic layer and the fixed ferromagnetic layer.
Dependencies are inferred from the claim text.