Nanopatterned L10-FePt nanoparticles from single-source metallopolymer precursors for potential application in ferromagnetic bit-patterned media magnetic recording

A new single-source metallopolymer precursor P was applied for the synthesis of magnetic FePt nanoparticles, which was also suitable for patterning by high-throughput nanoimprint lithography to obtain ferromagnetic nanolines.

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Imprint resist properties for bit patterned media (BPM)

MRS Proceedings ◽

10.1557/opl.2011.1268 ◽

2011 ◽

Vol 1340 ◽

Author(s):

J. Lille ◽

T. Karis ◽

D. Vasquez ◽

T-W. Wu

Keyword(s):

Mechanical Properties ◽

Magnetic Recording ◽

Nanoimprint Lithography ◽

Low Cost ◽

Magnetic Media ◽

Bit Patterned Media ◽

Patterned Media ◽

Hard Drive ◽

Thickness Variations

ABSTRACTNanoimprint lithography is a low cost method which produces trillions of nanostructures on a substrate. One application of this technology is patterned magnetic media where a single imprint on a disk can create a masking layer with more than a trillion nanostructures. Several challenges exist to imprinting bit patterned media (BPM) at a density greater than 1Tbit/in2. This technology would allow an extension of hard drive magnetic recording at densities greater than 1Tbit/in2. One such challenge is imprint resist mechanical properties where the imprinted masking layer should be free of thickness variations and resist flop-over. Herein we describe the nanoindentation mechanical properties of several imprint resist systems along with analysis of imprinted features of BPM at densities between 200-482 Gdots/in2.

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Concatenated Coding Schemes for High Areal Density Bit-Patterned Media Magnetic Recording

IEEE Transactions on Magnetics ◽

10.1109/tmag.2017.2746339 ◽

2018 ◽

Vol 54 (2) ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

Hidetoshi Saito

Keyword(s):

Magnetic Recording ◽

Areal Density ◽

Concatenated Coding ◽

Bit Patterned Media ◽

Patterned Media ◽

Coding Schemes

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

Micromachines ◽

10.3390/mi12101264 ◽

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.

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