# Fileset

[SMS-3_Isogami.docx](https://mdr.nims.go.jp/filesets/8deab6db-70bf-4a4c-a51b-5d944a2b1ecc/download)

## Creator

[Shinji Isogami](https://orcid.org/0000-0001-7230-6090)

## Rights

[In Copyright](http://rightsstatements.org/vocab/InC/1.0/)

## Other metadata

[Advanced magnetic storage application using the nitrospinics materials](https://mdr.nims.go.jp/datasets/380ba81c-9772-4c38-aaf9-22ef83c9c626)

## Fulltext

(Title)Advanced magnetic storage application using the nitrospinics materials(Abstract) Magnetic storage systems, such as hard-disk-drives (HDDs) and nonvolatile magnetic random access memories (MRAMs), are further expected to boost their areal density capability with low power consumption and high-speed operation, in particular for the data center and the edge-AI servers. To overcome these issues, it is essential to evolve devices based on completely new concepts. For example, we have developed the advanced recording systems hybridized by a well-known spintronics phenomenon of spin-transfer-torque so far, which is regarded as the thermal-spin-torque heat assisted magnetic recording (TST-HAMR) [1]. Not only that, MRAM devises based on the spin–orbit torque (SOT) with two-dimensional (2D) materials have been demonstrated for enhanced data-storage scalability and low power consumption [2]. To expand the potential of 2D materials in SOT devices, we investigated Cr2N, an emerging 2D MXene. Epitaxial and polycrystalline 2D-Cr2N were realized by reactive nitridation sputtering, and field-free perpendicular magnetization switching was achieved with a critical current density comparable to W/CoFeB systems [3]. Note that the 2D-Cr2N exhibits isotropic SOT with respect to its in-plane mirror symmetry, overcoming the specific principle in conventional 2D materials such as transition-metal dichalcogenides [4]. X-ray magnetic circular dichroism revealed that this behavior originates from interfacial uncompensated Cr moments, antiparallel to the ferromagnet, which act as an efficient spin filter for z-polarized spins. These specific characteristics are originating from the efficient spintronic functionalities involved in the nitride-based materials, driven by strong p–d hybridization with interstitial nitrogen. These findings motivate the concept of “Nitrospinics,” nitrogen-enabled efficient and stable spintronic properties. This talk will highlight Nitrospinics-driven advances and their implications for future advanced magnetic storage applications [5].[1] S. Isogami et al., Acta Materialia, 286, 120743 (2025).[2] H. Yang et al., Nature 606, 663 (2022).[3] P. Kumar et al., Small 21, 2500626 (2025); P. Kumar et al., STAM 26, 2551484 (2025).[4] Y. Liu et al., ACS Nano 14, 9389 (2020).[5] S. Isogami et al., Adv. Electron. Mater. 9, 2200515 (2023).