Investigation of Dynamic Magnetization in FePt and FePd Disk Ferromagnets Using Micromagnetic Simulation

Ummaira Fadhilah, Candra Kurniawan, Dede Djuhana

Research output: Contribution to journalConference articlepeer-review

Abstract

In this study, we have observed the magnetic hysteresis loop of the highly anisotropic ferromagnetic materials FePt and FePd with disk model by micromagnetic simulation method based on the Landau-Lifshitz-Gilbert (LLG) equation. We used disk shaped model with varied size from 50 to 500 nm, thicknesses of 5 and 10 nm, and damping constant = 0.05. The cell size of 2.5 × 2.5 × 2.5 nm3 was used and the in-plane and out-plane fields were applied to the materials. The results showed that the hysteresis loop has a large coercivity when the external in-plane field and close to zero when the external out-of-plane field was applied. This characteristic was similar as typical of the material's hysteresis loops given the field toward the hard-axis. However, coercivity still observed in materials with size below ≤ 100 nm with ranging values between 20 and 80 mT. From the results, a certain value of the coercivity field appeared in out-plane applied field indicated a perpendicular magnetic anisotropy (PMA) behaviour in FePt and FePd ferromagnets. Moreover, the nucleation field was shifted as the material's size varied. The results showed that the size affected the magnetic properties of the FePt and FePd thin layers.

Original languageEnglish
Article number012010
JournalIOP Conference Series: Materials Science and Engineering
Volume553
Issue number1
DOIs
Publication statusPublished - 12 Nov 2019
Event19th International Union of Materials Research Societies - International Conference in Asia, IUMRS-ICA 2018 - Bali, Indonesia
Duration: 30 Oct 20182 Nov 2018

Keywords

  • Fepd
  • Fept
  • Hysteresis loop
  • Micromagnetic simulation
  • Pma

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