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Micromagnetic Simulation of $L1_{0}$-FePt-Based Exchange-Coupled-Composite-Bit-Patterned Media with Microwave-Assisted Magnetic Recording at Ultrahigh Areal Density
| Content Provider | MDPI |
|---|---|
| Author | Khunkitti, Pirat Wannawong, Naruemon Jongjaihan, Chavakon Siritaratiwat, Apirat Kruesubthaworn, Anan Kaewrawang, Arkom |
| Copyright Year | 2021 |
| Description | In this work, we propose exchange-coupled-composite-bit-patterned media (ECC-BPM) with microwave-assisted magnetic recording (MAMR) to improve the writability of the magnetic media at a 4 $Tb/in^{2}$ recording density. The suitable values of the applied microwave field’s frequency and the exchange coupling between magnetic dots, $A_{dot}$, of the proposed media were evaluated. It was found that the magnitude of the switching field, $H_{sw}$, of the bilayer ECC-BPM is significantly lower than that of a conventional BPM. Additionally, using the MAMR enables further reduction of $H_{sw}$ of the ECC-BPM. The suitable frequency of the applied microwave field for the proposed media is 5 GHz. The dependence of $A_{dot}$ on the $H_{sw}$ was additionally examined, showing that the $A_{dot}$ of 0.14 pJ/m is the most suitable value for the proposed bilayer ECC-BPM. The physical explanation of the $H_{sw}$ of the media under a variation of MAMR and $A_{dot}$ was given. Hysteresis loops and the magnetic domain of the media were characterized to provide further details on the results. The lowest $H_{sw}$ found in our proposed media is 12.2 kOe, achieved by the bilayer ECC-BPM with an $A_{dot}$ of 0.14 pJ/m using a 5 GHz MAMR. |
| Starting Page | 1264 |
| e-ISSN | 2072666X |
| DOI | 10.3390/mi12101264 |
| Journal | Micromachines |
| Issue Number | 10 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-10-17 |
| Access Restriction | Open |
| Subject Keyword | Micromachines Condensed Matter Physics Bit-patterned Media Exchange-coupled-composite Media Microwave-assisted Magnetic Recording Hysteresis Loop |
| Content Type | Text |
| Resource Type | Article |
