Magnetization compensation and spin reorientation transition in ferrimagnetic DyCo5 : Multiscale modeling and element-specific measurements

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2017
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Khmelevskyi, Sergii
Deak, Andras
Abrudan, Radu-Marius
Schmitz, Detlef
Radu, Ilie
Radu, Florin
Szunyogh, László
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Physical Review B. 2017, 96(2), 024412. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.96.024412
Zusammenfassung

We use a multiscale approach linking ab initio calculations for the parametrization of an atomistic spin model with spin dynamics simulations based on the stochastic Landau-Lifshitz-Gilbert equation to investigate the thermal magnetic properties of the ferrimagnetic rare-earth transition-metal intermetallic DyCo5. Our theoretical findings are compared to elemental resolved measurements on DyCo5 thin films using the x-ray magnetic circular dichroism technique. With our model, we are able to accurately compute the complex temperature dependence of the magnetization. The simulations yield a Curie temperature of TC=1030K and a compensation point of Tcomp=164K, which is in a good agreement with our experimental result of Tcomp=120K. The spin reorientation transition is a consequence of competing elemental magnetocrystalline anisotropies in connection with different degrees of thermal demagnetization in the Dy and Co sublattices. Experimentally, we find this spin reorientation in a region from TSR1,2=320 to 360K, whereas in our simulations the Co anisotropy appears to be underestimated, shifting the spin reorientation to higher temperatures.

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ISO 690DONGES, Andreas, Sergii KHMELEVSKYI, Andras DEAK, Radu-Marius ABRUDAN, Detlef SCHMITZ, Ilie RADU, Florin RADU, László SZUNYOGH, Ulrich NOWAK, 2017. Magnetization compensation and spin reorientation transition in ferrimagnetic DyCo5 : Multiscale modeling and element-specific measurements. In: Physical Review B. 2017, 96(2), 024412. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.96.024412
BibTex
@article{Donges2017-07-11Magne-39674,
  year={2017},
  doi={10.1103/PhysRevB.96.024412},
  title={Magnetization compensation and spin reorientation transition in ferrimagnetic DyCo<sub>5</sub> : Multiscale modeling and element-specific measurements},
  number={2},
  volume={96},
  issn={2469-9950},
  journal={Physical Review B},
  author={Donges, Andreas and Khmelevskyi, Sergii and Deak, Andras and Abrudan, Radu-Marius and Schmitz, Detlef and Radu, Ilie and Radu, Florin and Szunyogh, László and Nowak, Ulrich},
  note={Article Number: 024412}
}
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