A New Highly Anisotropic Rh-Based Heusler Compound for Magnetic Recording

A New Highly Anisotropic Rh-Based Heusler Compound for Magnetic Recording

© 2020 The Authors. Published by Wiley-VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 32(2020), 45 vom: 07. Nov., Seite e2004331
1. Verfasser: He, Yangkun (VerfasserIn)
Weitere Verfasser: Fecher, Gerhard H, Fu, Chenguang, Pan, Yu, Manna, Kaustuv, Kroder, Johannes, Jha, Ajay, Wang, Xiao, Hu, Zhiwei, Agrestini, Stefano, Herrero-Martín, Javier, Valvidares, Manuel, Skourski, Yurii, Schnelle, Walter, Stamenov, Plamen, Borrmann, Horst, Tjeng, Liu Hao, Schaefer, Rudolf, Parkin, Stuart S P, Coey, John Michael D, Felser, Claudia
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2020
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article 4d magnetism magnetic hardness parameter magnetic recording magnetocrystalline anisotropy tetragonal Heusler alloys
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520 |a 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, Rh2 CoSb 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 μ0 Ms  = 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 Rh2 CoSb a candidate for the development of heat-assisted writing with a recording density in excess of 10 Tb in.-2 
650 4 |a Journal Article 
650 4 |a 4d magnetism 
650 4 |a magnetic hardness parameter 
650 4 |a magnetic recording 
650 4 |a magnetocrystalline anisotropy 
650 4 |a tetragonal Heusler alloys 
700 1 |a Fecher, Gerhard H  |e verfasserin  |4 aut 
700 1 |a Fu, Chenguang  |e verfasserin  |4 aut 
700 1 |a Pan, Yu  |e verfasserin  |4 aut 
700 1 |a Manna, Kaustuv  |e verfasserin  |4 aut 
700 1 |a Kroder, Johannes  |e verfasserin  |4 aut 
700 1 |a Jha, Ajay  |e verfasserin  |4 aut 
700 1 |a Wang, Xiao  |e verfasserin  |4 aut 
700 1 |a Hu, Zhiwei  |e verfasserin  |4 aut 
700 1 |a Agrestini, Stefano  |e verfasserin  |4 aut 
700 1 |a Herrero-Martín, Javier  |e verfasserin  |4 aut 
700 1 |a Valvidares, Manuel  |e verfasserin  |4 aut 
700 1 |a Skourski, Yurii  |e verfasserin  |4 aut 
700 1 |a Schnelle, Walter  |e verfasserin  |4 aut 
700 1 |a Stamenov, Plamen  |e verfasserin  |4 aut 
700 1 |a Borrmann, Horst  |e verfasserin  |4 aut 
700 1 |a Tjeng, Liu Hao  |e verfasserin  |4 aut 
700 1 |a Schaefer, Rudolf  |e verfasserin  |4 aut 
700 1 |a Parkin, Stuart S P  |e verfasserin  |4 aut 
700 1 |a Coey, John Michael D  |e verfasserin  |4 aut 
700 1 |a Felser, Claudia  |e verfasserin  |4 aut 
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