Two-Dimensional Magnetic Recording Technologies

Two-dimensional magnetic recording encompasses a suite of emerging methods designed to overcome the limits of conventional one-dimensional bit arrangements by exploiting both down-track and cross-track degrees of freedom. By introducing structured media such as bit-patterned domains, shingled and interlaced tracks, and even multiple recording layers, these approaches aim to push areal densities well beyond 1 Tb in⁻². Key innovations include lithographically defined magnetic islands for bit-patterned media, heat-assisted writing to sharpen thermal gradients and improve magnetic switching, and advanced multi-head reading architectures to extract high-fidelity signals in the presence of two-dimensional interference. Central challenges lie in mitigating inter-symbol and inter-track crosstalk, compensating for track mis-registration and media noise, and developing low-complexity detection and equalisation schemes. Collectively, these technologies promise to sustain the exponential growth of storage capacity for data-centre, cloud and edge-computing applications.

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Two-Dimensional Magnetic Recording Technologies publication trend

The graph below shows the total number of articles in two-dimensional magnetic recording technologies across all publications each year (not limited to Nature Index journals).

Technical terms

Two-dimensional magnetic recording (TDMR): A methodology in which information is encoded and retrieved by considering both down-track and cross-track magnetic interactions to increase areal density.

Bit-patterned media recording (BPMR): A technology that stores each bit in a lithographically defined magnetic island, reducing magnetic noise and enabling higher densities.

Inter-symbol interference (ISI): Crosstalk between adjacent bits along the down-track direction that degrades signal clarity.

Inter-track interference (ITI): Crosstalk between neighbouring tracks in the cross-track direction that impairs detection accuracy.

Heat assisted interlaced magnetic recording (HIMR): An approach that alternates high-temperature and low-temperature tracks to refine magnetic switching and manage two-dimensional interference.

Track mis-registration (TMR): The misalignment of the read head relative to the intended track, which increases error rates if not corrected.

References

1. Suppression of ITI by array head reading and 2D-equalization. AIP Advances (2017).
2. Utilization of multiple read heads for TMR prediction and correction in bit-patterned media recording. AIP Advances (2016).
3. Detection Scheme With Joint Intertrack Interference and Media Noise Mitigations for Heat Assisted Interlaced Magnetic Recording. IEEE Access (2022).
4. An MLP-based skew angle mitigation method for bit-patterned magnetic recording. IEICE Electronics Express (2024).
5. Bit-island arrangement and signal processing in double-layer magnetic recording technology. AIP Advances (2024).