Hybrid synthetic antiferromagnetic layer for perpendicular magnetic tunnel junction (MTJ)
First Claim
1. A magnetic tunnel junction (MTJ) device, comprising:
- a free layer;
a barrier layer, coupled to the free layer;
a reference layer coupled to the barrier layer; and
a fixed layer, coupled to the reference layer, the fixed layer comprising;
a hybrid first synthetic antiferromagnetic (SAF) multilayer structure having a first perpendicular magnetic anisotropy (PMA) and a first damping constant, the hybrid first SAF multilayer structure comprising a first multilayer stack of a first material layer and a second material layer arranged in a first alternating pattern and a second multilayer stack of the first material layer and a third material layer arranged in a second alternating pattern;
a second SAF multilayer stack having a second perpendicular magnetic anisotropy (PMA) and a second damping constant lower than the first damping constant, the second SAF multilayer being closer to the barrier layer than the hybrid first SAF multilayer structure; and
an SAF coupling layer between the hybrid first SAF multilayer structure and the second SAF stack, in which the second PMA is lower than the first PMA.
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Abstract
A magnetic tunnel junction (MTJ) device includes a free layer. The MTJ also includes a barrier layer coupled to the free layer. The MTJ also has a fixed layer, coupled to the barrier layer. The fixed layer includes a first synthetic antiferromagnetic (SAF) multilayer having a first perpendicular magnetic anisotropy (PMA) and a first damping constant. The fixed layer also includes a second SAF multilayer having a second perpendicular magnetic anisotropy (PMA) and a second damping constant lower than the first damping constant. The first SAF multilayer is closer to the barrier layer than the second SAF multilayer. The fixed layer also includes a SAF coupling layer between the first and the second SAF multilayers.
71 Citations
10 Claims
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1. A magnetic tunnel junction (MTJ) device, comprising:
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a free layer; a barrier layer, coupled to the free layer; a reference layer coupled to the barrier layer; and a fixed layer, coupled to the reference layer, the fixed layer comprising; a hybrid first synthetic antiferromagnetic (SAF) multilayer structure having a first perpendicular magnetic anisotropy (PMA) and a first damping constant, the hybrid first SAF multilayer structure comprising a first multilayer stack of a first material layer and a second material layer arranged in a first alternating pattern and a second multilayer stack of the first material layer and a third material layer arranged in a second alternating pattern; a second SAF multilayer stack having a second perpendicular magnetic anisotropy (PMA) and a second damping constant lower than the first damping constant, the second SAF multilayer being closer to the barrier layer than the hybrid first SAF multilayer structure; and an SAF coupling layer between the hybrid first SAF multilayer structure and the second SAF stack, in which the second PMA is lower than the first PMA. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A magnetic tunnel junction (MTJ) device, comprising:
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a free layer; a barrier layer, coupled to the free layer; a reference layer coupled to the barrier layer; and a fixed layer, coupled to the reference layer, the fixed layer comprising; a hybrid first synthetic antiferromagnetic (SAF) multilayer structure having a first perpendicular magnetic anisotropy (PMA) and a first damping constant, the hybrid first SAF multilayer structure comprising a first multilayer stack of a first material layer and a second material layer arranged in a first alternating pattern and a second multilayer stack of the first material layer and a third material layer arranged in a second alternating pattern; means for providing a second perpendicular magnetic anisotropy (PMA) and a second damping constant lower than the first damping constant, the second providing means being closer to the barrier layer than the hybrid first SAF multilayer structure; and means for coupling the hybrid first SAF multilayer structure and the second providing means, in which the second PMA is lower than the first PMA. - View Dependent Claims (10)
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Specification