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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Magnetostatic interactions in antiferromagnetically coupled patterned media.

S Deng¹, K O Aung, S N Piramanayagam

¹Data Storage Institute, A*STAR (Agency for Science Technology and Research), 5, Engineering Drive 1, Singapore 117608, Singapore.

Journal of Nanoscience and Nanotechnology

|April 1, 2011

Summary

Antiferromagnetically coupled (AFC) media reduce magnetostatic interactions in patterned magnetic storage. Increasing AFC stabilizing layer thickness enhances thermal stability and coercivity in closely spaced bits.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Magnetostatic interactions significantly impact the performance of patterned magnetic media, leading to wider switching field distributions and reduced thermal stability.
Antiferromagnetically coupled (AFC) structures offer a potential solution by reducing remanent magnetization (M(r)) and thus mitigating magnetostatic interactions.

Purpose of the Study:

To investigate the magnetic reversal behavior of patterned AFC CoCrPt:oxide bilayer systems.
To understand the influence of magnetostatic interactions on switching field distribution (SFD) in patterned media.
To evaluate the effectiveness of AFC structures in enhancing thermal stability and coercivity.

Main Methods:

Fabrication of single-domain patterned AFC CoCrPt:oxide bilayer systems with perpendicular magnetic anisotropy.
Magnetic Force Microscopy (MFM) was employed to image the remanence state of bits after magnetic field application.
Systematic variation of the stabilizing layer thickness and bit spacing to study their effects on magnetic reversal.

Main Results:

A notable increase in both stability and coercivity was observed with increasing stabilizing layer thickness for bits spaced at 40 nm.
The study confirmed that AFC structures effectively reduce magnetostatic interactions in patterned media.
Reduced M(r) in AFC media leads to enhanced thermal stability without compromising writability.

Conclusions:

AFC structures are highly effective in minimizing magnetostatic interactions in patterned magnetic media.
Optimizing the stabilizing layer thickness in AFC media is crucial for achieving high thermal stability and coercivity.
Patterned AFC media present a promising approach for developing advanced magnetic storage devices with improved performance.