Table 1.
Thermal and electrical properties of metals used in study. Theoretical SAR is calculated for a solid rod with the diameter of 0.965 mm heated in an RF system working at frequency of f = 360 kHz and magnetic field intensity of H0 = 20 kA/m.
| Metal | Skin depth (δ) (μm) | Resistivity (ρe) (Ω.m) | Electrical conductivity (σ) (S/m) | Relative permeability (μr) (–) | Density (ρ) (g/cc) | Volumetric SARThe (W/cm3) | SARThe (W/g) |
|---|---|---|---|---|---|---|---|
| Copper | 140 | 1.68 × 10−8 | 5.96 × 107 | 0.9999 | 8.96 | 936 | 105 |
| Aluminum | 108 | 2.82 × 10−8 | 3.50 × 107 | 0.9994 | 2.70 | 1221 | 450 |
| Nitinol | 760 | 82 × 10−8 | 0.12 × 107 | 1.0020 | 6.50 | 6550 | 1000 |