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 ?0Ms = 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 ?B 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.
%0 Journal Article
%1 he2020highly
%A He, Yangkun
%A Fecher, Gerhard H.
%A Fu, Chenguang
%A Pan, Yu
%A Manna, Kaustuv
%A Kroder, Johannes
%A Jha, Ajay
%A Wang, Xiao
%A Hu, Zhiwei
%A Agrestini, Stefano
%A Herrero-Martín, Javier
%A Valvidares, Manuel
%A Skourski, Yurii
%A Schnelle, Walter
%A Stamenov, Plamen
%A Borrmann, Horst
%A Tjeng, Liu Hao
%A Schaefer, Rudolf
%A Parkin, Stuart S. P.
%A Coey, John Michael D.
%A Felser, Claudia
%D 2020
%J Adv. Mater.
%K 4d Heusler alloys anisotropy hardness magnetic magnetism magnetocrystalline parameter recording tetragonal
%N 45
%P 2004331
%R https://doi.org/10.1002/adma.202004331
%T A new highly anisotropic Rh-Based Heusler compound for magnetic recording
%U https://doi.org/10.1002/adma.202004331
%V 32
%X 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 ?0Ms = 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 ?B 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.
@article{he2020highly,
abstract = {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 ?0Ms = 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 ?B 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.},
added-at = {2023-11-02T17:44:47.000+0100},
author = {He, Yangkun and Fecher, Gerhard H. and Fu, Chenguang and Pan, Yu and Manna, Kaustuv and Kroder, Johannes and Jha, Ajay and Wang, Xiao and Hu, Zhiwei and Agrestini, Stefano and Herrero-Martín, Javier and Valvidares, Manuel and Skourski, Yurii and Schnelle, Walter and Stamenov, Plamen and Borrmann, Horst and Tjeng, Liu Hao and Schaefer, Rudolf and Parkin, Stuart S. P. and Coey, John Michael D. and Felser, Claudia},
biburl = {https://www.bibsonomy.org/bibtex/2128f7e8f91ae8729489dde96f5a7de7e/ctqmat},
day = 07,
doi = {https://doi.org/10.1002/adma.202004331},
interhash = {9a92025b09a19cc77d9df3535d68bd3b},
intrahash = {128f7e8f91ae8729489dde96f5a7de7e},
issn = {09359648},
journal = {Adv. Mater.},
keywords = {4d Heusler alloys anisotropy hardness magnetic magnetism magnetocrystalline parameter recording tetragonal},
month = {10},
number = 45,
pages = 2004331,
timestamp = {2023-11-06T11:32:47.000+0100},
title = {A new highly anisotropic Rh-Based Heusler compound for magnetic recording},
url = {https://doi.org/10.1002/adma.202004331},
volume = 32,
year = 2020
}