Method and system for providing magnetic junctions including a package structure usable in spin transfer torque memories

摘要

A method and system for providing a magnetic junction usable in a magnetic device are described. The magnetic includes a pinned layer, a nonmagnetic spacer layer, a free layer, and package structure(s). The pinned layer has a pinned layer perimeter and a top surface. The nonmagnetic spacer layer is on at least part of the top surface and between the pinned and free layers. The free layer has a free layer perimeter. The package structure(s) are ferromagnetic and encircles at least one of the free layer and the pinned layer. The package structure(s) are ferromagnetically coupled with the pinned layer. The magnetic junction is configured such that the free layer is switchable between stable magnetic states when a write current is passed through the magnetic junction.

主权项

1. A magnetic junction for use in a magnetic device comprising:
a first pinned layer having a pinned layer perimeter and a top surface; a nonmagnetic spacer layer residing on at least a first portion of the top surface; a free layer, the nonmagnetic spacer layer residing between the pinned layer and the free layer, the free layer having a free layer perimeter, the free layer perimeter being not larger than the pinned layer perimeter; and at least one package structure, the at least one package structure being ferromagnetic and encircling at least one of the free layer and the pinned layer, the at least one package structure being ferromagnetically coupled with the first pinned layer; wherein the magnetic junction is configured such that the free layer is switchable between a plurality of stable magnetic states when a write current is passed through the magnetic junction.