Table 1 Device and material parameters for SOT and STT operation, along with their default parameters established through literature and prior works10,38,39,40,41,42

From: AI-guided framework for the design of materials and devices for magnetic-tunnel-junction-based true random number generators

Spin Orbit Torque (SOT) MTJ

Parameter

Symbol

Min Range

Max Range

Defaults

Parameter Type

Gilbert Damping Constant

α

0.01

0.1

0.03

Material

Surface Anisotropy Energy

Ki

0.2 × 10−3 J/m2

1 × 10−3 J/m2

1 × 10−3 J/m2

Device

Saturation Magnetization

Ms

0.3 × 106 A/m

2 × 106 A/m

1.2 × 106 A/m

Material

Parallel Resistance

Rp

500 Ω

50,000 Ω

5000 Ω

Device

Spin Hall Angle

η

0.1

2

0.3

Material

Current Density

JSOT

0.01 × 1012 A/m2

5 × 1012 A/m2

0.5 × 1012 A/m2

Device

Pulse Width

tpulse

0.5 ns

75 ns

10 ns

Device

Spin Transfer Torque (STT) MTJ

Parameter

Symbol

Min Range

Max Range

Defaults

Parameter Type

Gilbert Damping Constant

α

0.01

0.1

0.03

Material

Surface Anisotropy Energy

Ki

0.2 × 10−3 J/m2

1 × 10−3 J/m2

1 × 10−3 J/m2

Device

Saturation Magnetization

Ms

0.3 × 106 A/m

2 × 106 A/m

1.2 × 106 A/m

Material

Parallel Resistance

Rp

500 Ω

50,000 Ω

5000 Ω

Device

Pulse Width

tpulse

0.5 ns

75 ns

1 ns

Device