Performance Limitation of Microwave Assisted Magnetic Recording Combined With Exchange Coupled Composite Media Explored by Genetic Algorithm

2013 ◽  
Vol 49 (7) ◽  
pp. 3640-3643 ◽  
Author(s):  
Hiroshi Fukuda ◽  
Yoshihiro Shiroishi
Keyword(s):  
Genetic Algorithm ◽  
Magnetic Recording ◽  
Composite Media ◽  
Microwave Assisted ◽  
Performance Limitation ◽  
Exchange Coupled Composite

Microwave-Assisted Magnetic Recording on Exchange Coupled Composite Media

2016 ◽  
Vol 52 (7) ◽  
pp. 1-4 ◽  
Author(s):  
Simon John Greaves ◽  
Yasushi Kanai ◽  
Hiroaki Muraoka
Keyword(s):  
Magnetic Recording ◽  
Composite Media ◽  
Microwave Assisted ◽  
Exchange Coupled Composite

scholarly journals Micromagnetic Simulation of L10-FePt-Based Exchange-Coupled-Composite-Bit-Patterned Media with Microwave-Assisted Magnetic Recording at Ultrahigh Areal Density

Micromachines ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1264
Author(s):  
Pirat Khunkitti ◽  
Naruemon Wannawong ◽  
Chavakon Jongjaihan ◽  
Apirat Siritaratiwat ◽  
Anan Kruesubthaworn ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Magnetic Domain ◽  
Hysteresis Loops ◽  
Areal Density ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Microwave Assisted ◽  
The Media ◽  
5 Ghz ◽  
Exchange Coupled Composite

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/in2 recording density. The suitable values of the applied microwave field’s frequency and the exchange coupling between magnetic dots, Adot, of the proposed media were evaluated. It was found that the magnitude of the switching field, Hsw, of the bilayer ECC-BPM is significantly lower than that of a conventional BPM. Additionally, using the MAMR enables further reduction of Hsw of the ECC-BPM. The suitable frequency of the applied microwave field for the proposed media is 5 GHz. The dependence of Adot on the Hsw was additionally examined, showing that the Adot of 0.14 pJ/m is the most suitable value for the proposed bilayer ECC-BPM. The physical explanation of the Hsw of the media under a variation of MAMR and Adot was given. Hysteresis loops and the magnetic domain of the media were characterized to provide further details on the results. The lowest Hsw found in our proposed media is 12.2 kOe, achieved by the bilayer ECC-BPM with an Adot of 0.14 pJ/m using a 5 GHz MAMR.

Microwave-assisted magnetic recording simulation on exchange-coupled composite medium

2012 ◽  
Vol 111 (7) ◽  
pp. 07B711 ◽  
Author(s):  
T. Tanaka ◽  
A. Kato ◽  
Y. Furomoto ◽  
A. F. Md Nor ◽  
Y. Kanai ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Composite Medium ◽  
Microwave Assisted ◽  
Exchange Coupled Composite

Microwave Assisted Magnetization Reversal on Exchange Coupled Composite Media

2014 ◽  
Vol 931-932 ◽  
pp. 1265-1269 ◽  
Author(s):  
Naruemon Wannawong ◽  
Warunee Tipcharoen ◽  
Arkom Kaewrawang
Keyword(s):  
Magnetic Recording ◽  
Magnetization Reversal ◽  
Microwave Field ◽  
Single Layer ◽  
Microwave Frequency ◽  
Areal Density ◽  
Disk Drive ◽  
Microwave Assisted ◽  
Superparamagnetic Limit ◽  
Exchange Coupled Composite

To overcome superparamagnetic limit, microwave assisted magnetic recording (MAMR) is one interesting magnetic recording technology. Therefore, the effect of microwave on magnetization reversal in media should be analyzed. In this work, we propose the MAMR to decrease switching field (coercivity, Hsw) in exchange coupled composite (ECC) media by using the micromagnetic simulation based on the Landau - Lifshitz - Gilbert equation. The Hsw of single layer and ECC media without microwave field is 110.90 and 7.7 kOe, respectively. When the oscillating microwave field is added, Hsw of single layer media with microwave frequency of 2.5 - 40 GHz is lower than 110.90 kOe. Likewise, Hsw of ECC media with microwave frequency of 5 - 16 GHz is lower than 7.7 kOe and has the lowest value of 4.9 kOe at frequency of 10 GHz. The results from this work lead to solve superparamagnetic limit and increase areal density in hard disk drive.

Exchange Coupled Composite Media for Magnetic Recording – Issues and Challenges

2013 ◽  
Vol 701 ◽  
pp. 154-162 ◽  
Author(s):  
Horia Gavrilǎ ◽  
Doina Gavrilǎ
Keyword(s):  
Thermal Stability ◽  
Magnetic Recording ◽  
Switching Process ◽  
Composite Media ◽  
Recording Heads ◽  
Exchange Coupled Composite ◽  
Thermal Stability Of

The paper is devoted to the analysis of the exchange coupled composite (ECC) media. The principle of ECC media, the switching process and the thermal stability of these media are analysed. The features of ECC media ask for some changes in the design of recording heads; a lot of proposed geometries of these heads are presented. Finally, challenges and possible improvements of ECC media are summarized.

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