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Recent experimental data demonstrate emerging magnetic order in platinumatomically thin nanowires. Furthermore, an unusual form of magnetic anisotropy-- colossal magnetic anisotropy (CMA) -- was earlier predicted to exist inatomically thin platinum nanowires. Using spin dynamics simulations based onfirst-principles calculations, we here explore the spin dynamics of atomicallythin platinum wires to reveal the spin relaxation signature of colossalmagnetic anisotropy, comparing it with other types of anisotropy such asuniaxial magnetic anisotropy (UMA). We find that the CMA alters the spinrelaxation process distinctly and, most importantly, causes a large speed-up ofthe magnetic relaxation compared to uniaxial magnetic anisotropy. The magneticbehavior of the nanowire exhibiting CMA should be possible to identifyexperimentally at the nanosecond time scale for temperatures below 5 K. Thistime-scale is accessible in e.g., soft x-ray free electron laser experiments.

Spin relaxation signature of colossal magnetic anisotropy in platinum atomic chains