Abstract
A fully quantum-mechanical calculation of the Gilbert damping constant α in magnetic trilayers is done by employing the torque-correlation formula within a realistic tight-binding model. A remarkable enhancement of α in Co/NM1/NM2 trilayers is obtained due to adding the caps NM2=Pd, Pt, and it decays with the thickness of the spacers NM1=Cu, Ag, Au in agreement with experiment. Nonlocal origin of the Gilbert damping is visualized with its atomic layer contributions. It is shown that magnetization in Co is damped remotely by strong spin-orbit coupling in NM2 via quantum states with large amplitude in both Co and NM2.
| Original language | English |
|---|---|
| Article number | 214435 |
| Journal | Physical review B: Condensed matter and materials physics |
| Volume | 91 |
| Issue number | 21 |
| DOIs | |
| Publication status | Published - 30 Jun 2015 |
| Externally published | Yes |
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