Magnetic memory element with composite fixed layer
First Claim
1. A magnetic tunnel junction (MTJ) memory element comprising:
- a seed layer; and
a magnetic fixed layer including a first magnetic fixed sublayer formed adjacent to said seed layer and a second magnetic fixed sublayer separated from said first magnetic fixed sublayer by a first perpendicular enhancement layer, said first and second magnetic fixed sublayers having a first fixed magnetization direction substantially perpendicular to layer planes thereof,wherein said second magnetic fixed sublayer has a multilayer structure formed by interleaving layers of a first type material with layers of a second type material, at least one of said first and second type materials being magnetic.
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Abstract
The present invention is directed to an MTJ memory element including a magnetic free layer structure which includes one or more magnetic free layers that have a same variable magnetization direction substantially perpendicular to layer planes thereof; an insulating tunnel junction layer formed adjacent to the magnetic free layer structure; a magnetic reference layer structure comprising a first magnetic reference layer formed adjacent to the insulating tunnel junction layer and a second magnetic reference layer separated therefrom by a perpendicular enhancement layer with the first and second magnetic reference layers having a first fixed magnetization direction substantially perpendicular to layer planes thereof; an anti-ferromagnetic coupling layer formed adjacent to the second magnetic reference layer opposite the perpendicular enhancement layer; and a magnetic fixed layer comprising first and second magnetic fixed sublayers with the second magnetic fixed sublayer formed adjacent to the anti-ferromagnetic coupling layer opposite the second magnetic reference layer.
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Citations
24 Claims
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1. A magnetic tunnel junction (MTJ) memory element comprising:
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a seed layer; and a magnetic fixed layer including a first magnetic fixed sublayer formed adjacent to said seed layer and a second magnetic fixed sublayer separated from said first magnetic fixed sublayer by a first perpendicular enhancement layer, said first and second magnetic fixed sublayers having a first fixed magnetization direction substantially perpendicular to layer planes thereof, wherein said second magnetic fixed sublayer has a multilayer structure formed by interleaving layers of a first type material with layers of a second type material, at least one of said first and second type materials being magnetic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A magnetic tunnel junction (MTJ) memory element comprising:
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a seed layer; a magnetic fixed layer including a first magnetic fixed sublayer formed adjacent to said seed layer and a second magnetic fixed sublayer separated from said first magnetic fixed sublayer by a first perpendicular enhancement layer, said first and second magnetic fixed sublayers having a first fixed magnetization direction substantially perpendicular to layer planes thereof; an anti-ferromagnetic coupling layer formed adjacent to said second magnetic fixed sublayer opposite said first perpendicular enhancement layer; a magnetic reference layer structure formed adjacent to said anti-ferromagnetic coupling layer opposite said second magnetic fixed sublayer, said magnetic reference layer structure including one or more magnetic reference layers having a second fixed magnetization direction that is substantially perpendicular to layer planes thereof and is substantially opposite to said first fixed magnetization direction; an insulating tunnel junction layer formed adjacent to said magnetic reference layer structure; and a magnetic free layer structure formed adjacent to said insulating tunnel junction layer opposite said magnetic reference layer structure, said magnetic free layer structure including one or more magnetic free layers that have a same variable magnetization direction substantially perpendicular to layer planes thereof. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification