High Performance MRAM with Spin-Transfer-Torque and Voltage-Controlled Magnetic Anisotropy Effects
Abstract
:Featured Application
Abstract
1. Introduction
2. MTJ Fundamental and Physical Modeling
2.1. STT-MTJ
2.2. VCMA-Assisted Switching
3. High Performance MRAM Writing
3.1. MRAM Writing
3.2. Energy Efficiency
3.3. Stochastic Effects
3.4. Reliability Issues
3.4.1. Process Variation
3.4.2. Dielectric Breakdown
3.4.3. MTJ Thermal Stability
4. Discussion
5. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Memory | SRAM | DRAM | NOR-Flash | NAND-flash | STT-MRAM | PCRAM | ReRAM | FeRAM 1 |
---|---|---|---|---|---|---|---|---|
Cell area | >100 F2 | 6 F2 | 10 F2 | 4 F2 (3D) | 6∼50 F2 | 4∼30 F2 | 4∼12 F2 | 15∼35 F2 |
Multi bit | 1 | 1 | 2 | 3 | 1 | 2 | 2 | 1 |
Supply | <1 V | <1 V | >10 V | >10 V | <1.5 V | <3 V | <3 V | <1.8 V |
Read duration | ∼1 ns | ∼10 ns | ∼50 ns | ∼10 µs | <10 ns | <10 ns | <10 ns | <10 ns |
Write latency | ∼1 ns | ∼10 ns | 10 µs–1 ms | 100 µs–1 ms | <10 ns | ∼50 ns | <10 ns | <5 ns |
Retention | N/A | ∼64 ms | >10 y | >10 y | >10 y | >10 y | >10 y | >10 y |
Endurance | >1016 | >1016 | >105 | >104 | >1015 | >109 | 106∼1012 | 1013 |
Write energy | ∼fJ/bit | ∼10 fJ/bit | ∼100 pJ/bit | ∼10 fJ/bit | ∼0.1pJ/bit | ∼10 pJ/bit | ∼0.1 pJ/bit | ∼10 fJ/bit |
Parameter | Description | STT-MTJ | VCMA-MTJ |
---|---|---|---|
TMR | Tunnel magnetoresistance ratio | 150% | 100% |
Tox | MTJ oxide barrier thickness | 0.7 nm | 1.3 nm |
Rp, Rap | MTJ resistance | 5 kΩ/12.5 kΩ | 100 kΩ/200 kΩ |
TFL | Free layer thickness | 1.2 nm | 1.19 nm |
z | Thermal stability | 71.6 | 73.7 |
Area | MTJ layout surface | 24 F2 | 12 F2 |
W/L | Access transistor width/length 1 | 300 nm/30 nm | 80 nm/30 nm |
Design specification | [39] | [26] | [25] | This Work |
---|---|---|---|---|
Technology node | 32 nm CMOS 1 | 32 nm CMOS | 40 nm CMOS | 28 nm FD-SOI |
Switching delay | 1–10 ns | 1.42 ns | 0.45 ns | 0.52 ns |
Dynamic energy | ~100 fJ/bit | 10.1 fJ/bit | 6.14 fJ/bit | 3.18 fJ/bit |
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Cai, H.; Kang, W.; Wang, Y.; Naviner, L.A.D.B.; Yang, J.; Zhao, W. High Performance MRAM with Spin-Transfer-Torque and Voltage-Controlled Magnetic Anisotropy Effects. Appl. Sci. 2017, 7, 929. https://doi.org/10.3390/app7090929
Cai H, Kang W, Wang Y, Naviner LADB, Yang J, Zhao W. High Performance MRAM with Spin-Transfer-Torque and Voltage-Controlled Magnetic Anisotropy Effects. Applied Sciences. 2017; 7(9):929. https://doi.org/10.3390/app7090929
Chicago/Turabian StyleCai, Hao, Wang Kang, You Wang, Lirida Alves De Barros Naviner, Jun Yang, and Weisheng Zhao. 2017. "High Performance MRAM with Spin-Transfer-Torque and Voltage-Controlled Magnetic Anisotropy Effects" Applied Sciences 7, no. 9: 929. https://doi.org/10.3390/app7090929