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- W2023679192 abstract "Measurements of the magnetostriction and magnetization of two ferromagnetic $mathrm{Pt}mathrm{Fe}$ alloys and a paramagnetic $mathrm{Pd}mathrm{Ni}$ alloy are presented. The Belov equation for the free energy of a weak itinerant ferromagnet including magnetoelastic terms is used to estimate the volume dependence of the Curie temperature ${T}_{C}$. For the alloy ${mathrm{Pt}}_{0.99}$${mathrm{Fe}}_{0.01}$, the resultant value is $frac{ensuremath{partial}mathrm{ln}{T}_{C}}{ensuremath{partial}ensuremath{omega}}=ensuremath{-}47$, where $ensuremath{omega}$, is the volume strain. The volume dependence of the magnetization $M$, determined from the magnetostriction, is field dependent and decreases monotonically from $frac{ensuremath{partial}mathrm{ln}M}{ensuremath{partial}ensuremath{omega}}=ensuremath{-}1.6$ at 35 kOe to $frac{ensuremath{partial}mathrm{ln}M}{ensuremath{partial}ensuremath{omega}}=ensuremath{-}37$ at 2 kOe, where it is still decreasing rapidly. This behavior is in disagreement with the $sensuremath{-}d$ interaction model, which was found to explain satisfactorily the behavior of $mathrm{Pd}mathrm{Fe}$ alloys. The model predicts that $frac{ensuremath{partial}mathrm{ln}M}{ensuremath{partial}ensuremath{omega}}$ should be field independent and of the same order of magnitude as $frac{ensuremath{partial}mathrm{ln}{T}_{C}}{ensuremath{partial}ensuremath{omega}}$. In the alloy ${mathrm{Pt}}_{0.97}$${mathrm{Fe}}_{0.03}$, it is not possible to estimate $frac{ensuremath{partial}mathrm{ln}{T}_{C}}{ensuremath{partial}ensuremath{omega}}$ from the Belov plots, because of domain effects. The value of $frac{ensuremath{partial}mathrm{ln}M}{ensuremath{partial}ensuremath{omega}}$ is constant and equal to - 0.5 above about 15 kOe, but increases considerably at lower fields, as in ${mathrm{Pt}}_{0.99}$${mathrm{Fe}}_{0.01}$, before domain effects intervene. The Belov equation is modified to describe the magnetostriction and magnetization of the paramagnetic alloy ${mathrm{Pd}}_{0.9811}$${mathrm{Ni}}_{0.0189}$, and thereby to estimate the value, $frac{ensuremath{partial}mathrm{ln}{ensuremath{chi}}_{A}}{ensuremath{partial}ensuremath{omega}}=ensuremath{-}19$, of the volume dependence of its susceptibility ${ensuremath{chi}}_{A}$. The Belov equation and its modification for a strongly paramagnetic metal describe satisfactorily the field dependence of the magnetostriction, but not the magnetization, both for the ferromagnetic $mathrm{Pt}mathrm{Fe}$ alloys and the $mathrm{Pd}mathrm{Ni}$ alloy." @default.
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- W2023679192 title "Magnetostriction of Dilute Magnetic Alloys" @default.
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- W2023679192 doi "https://doi.org/10.1103/physrevb.1.4361" @default.
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