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A new highly anisotropic Rh‐based Heusler compound for magnetic recording

DOI: 10.1002/adma.202004331 DOI Help

Authors: Yangkun He (Max‐Planck‐Institute for Chemical Physics of Solids) , Gerhard H. Fecher (Max‐Planck‐Institute for Chemical Physics of Solids) , Chenguang Fu (Max‐Planck‐Institute for Chemical Physics of Solids) , Yu Pan (Max‐Planck‐Institute for Chemical Physics of Solids) , Kaustuv Manna (Max‐Planck‐Institute for Chemical Physics of Solids) , Johannes Kroder (Max‐Planck‐Institute for Chemical Physics of Solids) , Ajay Jha (Trinity College Dublin) , Xiao Wang (Max‐Planck‐Institute for Chemical Physics of Solids) , Zhiwei Hu (Max‐Planck‐Institute for Chemical Physics of Solids) , Stefano Agrestini (Diamond Light Source) , Javier Herrero-martin (ALBA Synchrotron Light Source) , Manuel Valvidares (ALBA Synchrotron Light Source) , Yurii Skourski (Dresden High Magnetic Field Laboratory (HLD‐EMFL), Helmholtz‐zentrum Dresden–Rossendorf) , Walter Schnelle (Max‐Planck‐Institute for Chemical Physics of Solids) , Plamen Stamenov (Trinity College Dublin) , Horst Borrmann (Max‐Planck‐Institute for Chemical Physics of Solids) , Liu Hao Tjeng (Max‐Planck‐Institute for Chemical Physics of Solids) , Rudolf Schaefer (Leibniz Institute for Solid State and Materials Research (IFW) Dresden; TU Dresden) , Stuart S. P. Parkin (Max Planck Institute of Microstructure Physics) , John Michael D. Coey (Trinity College Dublin) , Claudia Felser (Max‐Planck‐Institute for Chemical Physics of Solids)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Advanced Materials , VOL 33

State: Published (Approved)
Published: October 2020

Open Access Open Access

Abstract: The development of high‐density magnetic recording media is limited by superparamagnetism in very small ferromagnetic crystals. Hard magnetic materials with strong perpendicular anisotropy offer stability and high recording density. To overcome the difficulty of writing media with a large coercivity, heat‐assisted magnetic recording was developed, rapidly heating the media to the Curie temperature Tc before writing, followed by rapid cooling. Requirements are a suitable Tc, coupled with anisotropic thermal conductivity and hard magnetic properties. Here, Rh2CoSb is introduced as a new hard magnet with potential for thin‐film magnetic recording. A magnetocrystalline anisotropy of 3.6 MJ m−3 is combined with a saturation magnetization of μ0Ms = 0.52 T at 2 K (2.2 MJ m−3 and 0.44 T at room temperature). The magnetic hardness parameter of 3.7 at room temperature is the highest observed for any rare‐earth‐free hard magnet. The anisotropy is related to an unquenched orbital moment of 0.42 μB on Co, which is hybridized with neighboring Rh atoms with a large spin–orbit interaction. Moreover, the pronounced temperature dependence of the anisotropy that follows from its Tc of 450 K, together with a thermal conductivity of 20 W m−1 K−1, make Rh2CoSb a candidate for the development of heat‐assisted writing with a recording density in excess of 10 Tb in.−2.

Journal Keywords: 4d magnetism; magnetic hardness parameter; magnetic recording; magnetocrystalline anisotropy; tetragonal; Heusler alloys

Subject Areas: Materials, Physics

Facility: BL29 (BOREAS) at ALBA; HZDR