Unipolar current switching in perpendicular magnetic tunnel junction (pMTJ) devices through reduced bipolar coercivity
First Claim
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1. A memory array, comprising:
- a plurality of bitlines;
a plurality of select lines; and
a plurality of memory elements located among and coupled to the plurality of bitlines and the plurality of select lines, each of the plurality of memory elements comprising a unipolar switching magnetic tunnel junction (MTJ) device and a select device, wherein the select device is a transistor, and wherein only a drain region and not a source region of the transistor is coupled to the unipolar switching MTJ device.
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Abstract
Approaches and structures for unipolar current switching in perpendicular magnetic tunnel junction (pMTJ) devices through reduced bipolar coercivity are described. In an example, a memory array includes a plurality of bitlines and a plurality of select lines. The memory array also includes a plurality of memory elements located among and coupled to the plurality of bitlines and the plurality of select lines. Each of the plurality of memory elements includes a unipolar switching magnetic tunnel junction (MTJ) device and a select device.
15 Citations
11 Claims
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1. A memory array, comprising:
- a plurality of bitlines;
a plurality of select lines; and a plurality of memory elements located among and coupled to the plurality of bitlines and the plurality of select lines, each of the plurality of memory elements comprising a unipolar switching magnetic tunnel junction (MTJ) device and a select device, wherein the select device is a transistor, and wherein only a drain region and not a source region of the transistor is coupled to the unipolar switching MTJ device. - View Dependent Claims (2, 3)
- a plurality of bitlines;
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4. A memory element, comprising:
a unipolar switching perpendicular magnetic tunnel junction (pMTJ) device; and
a select device coupled to the pMTJ device, wherein the select device is a transistor, and wherein only a drain region and not a source region of the transistor is coupled to the unipolar switching pMTJ device.- View Dependent Claims (5)
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6. A method of performing a unipolar switching operation of a magnetic memory element, the method comprising:
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applying an increasing negative bias to a magnetic tunnel junction (MTJ) memory element in an initial anti-parallel state; and
, subsequently, changing a resistance of the MTJ memory element from anti-parallel to parallel; and
, subsequently,further increasing the negative bias to the MTJ element; and
, subsequently, changing the resistance of the MTJ memory element from parallel to anti-parallel, wherein applying the increasing negative bias to the MTJ memory element in the initial anti-parallel state comprises driving with a drain region and not a source region of a select transistor coupled to the MTJ element. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification