1c:I[419806,["/_next/static/chunks/bb923814e1f4d2e9.js","/_next/static/chunks/dd3ee9f5b7716ca6.js","/_next/static/chunks/4204a0ae82542ca8.js","/_next/static/chunks/30036bedc5269936.js","/_next/static/chunks/6e1aa89a642f40be.js","/_next/static/chunks/cd5e572bc3e4eb92.js","/_next/static/chunks/8ffd0b71567920d8.js","/_next/static/chunks/67ea6dfd21f16c5f.js","/_next/static/chunks/24eb4379f68013fd.js","/_next/static/chunks/b8cd775ffdf935bd.js","/_next/static/chunks/983103cd9eb7b428.js","/_next/static/chunks/d4ac9dcf27f6ff52.js","/_next/static/chunks/294b9525248c8e5f.js"],"default"] 1d:T422,The properties of permanent magnets based on RCo 5 compounds arise from their strong uniaxial anisotropy. The anisotropy field at 4.2 K in YCo 5 is about 200 kOe. A polarized neutron study of YCo 5 revealed a very large orbital contribution to the magnetic moment on the Co I (2c) site, which indicates that the major part of the cobalt anisotropy originates from this site. The variations of the magnetic anisotropy of YCo 5 which occur when different substitutional atoms (Ni, Fe, Co pairs) modify the ideal structure, are in agreement with this view.1e:T4d4,The exchange coupling between rare-earth ($R$) and transition-metal ($T$) moments in ${R}_{x}{T}_{y}$ compounds is not so large as to hold the $R$ and $T$ moments rigidly parallel (for light rare-earth elements) or antiparallel (for heavy rare-earth elements); ionic magnetocrystalline anisotropy energy can be comparable to this intersublattice exchange. Anisotropy torques and/or an external field can induce canting between the sublattice moments. We show that this canting, even when small, can reduce the macroscopic effective anisotropy by a very large amount---more than an order of magnitude---from the intrinsic sublattice anisotropies. Consideration of the effects of canting reconcile hitherto conflicting reports, by spin-wave scattering and moment measurements, of the magnetic anisotropies of ${\mathrm{Ho}}_{2}$${\mathrm{Co}}_{17}$ and ${\mathrm{Ho}}_{2}$${\mathrm{Fe}}_{17}$. One conclusion of our analysis is that since a huge degeneration of macroscopic magnetic anisotropy, and hence of the coercivity, comes from sublattice flexing, it seems to follow that to increase coercivity one should be trying to increase $R\ensuremath{-}T$ exchange; the ionic magnetic anisotropy is already greater than its effective value.1f:T65d,

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