The structure and temperature stability of the magnetic properties of the Gd0.81Zr0.19(Co0.7Cu0.1Fe0.2)5.16 alloys after various heat treatment are investigated. It is shown that the heat treatment regimes determine the parameters of the nanostructure and the temperature stability of the magnetic properties of the alloys. The AFM studies of the surface of the Gd0.81Zr0.19(Co0.7Cu0.1Fe0.2)5.16 alloy samples showed that a cellular nanostructure is formed after annealing at 800°C, while the nanostructure parameter (cell size) of quenched and slowly cooled samples differ by 50%. The temperature specific magnetization studies show that the hysteresis characteristics (remanence magnetization and coercive force) of the alloys have temperature stability up to 500 K (227°C). It was found that thermal cycling of the Gd0.81Zr0.19(Co0.7Cu0.1Fe0.2)5.16 alloy in the range from 300 to 600 K (27–327°C) does not lead to changes in its magnetic properties at room temperatures. The second full heat treatment of the destructured sample after heating up to 1000 K (727°C), leads to a partial recovery of hysteresis properties, a change in the phase components of the alloy, and the destruction of the order of the nanostructure.
75.50.Ww Permanent magnets
75.50.Gg Ferrimagnetics
$^1$Tver State University
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