Magnetism and magnetic phase transition in nanowires of diamagnetically diluted superstrong magnets ε-In0.04Fe1.96O3

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Abstract

The temperature dependences of the magnetization of ε-In0.04Fe1.96O3 nanoparticles were measured in the cooling and heating regimes. At a temperature of 150 K, a sharp drop in their magnetization is observed. Evidence is obtained that the observed magnetic phase transition is accompanied by a reversal of the magnetization due to a first-order spin-reorientation transition. The experimental results are described in terms of the thermodynamic approach.

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About the authors

A. I. Dmitriev

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences

Author for correspondence.
Email: aid@icp.ac.ru
Russian Federation, Chernogolovka

M. S. Dmitrieva

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences

Email: aid@icp.ac.ru
Russian Federation, Chernogolovka

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2. Fig. 1. Temperature dependences of the magnetisation of ε-In0.04Fe1.96O3 nanoparticles measured at cooling (blue symbols) and heating (red symbols). The solid vertical line denotes the spin-reorientation transition temperature TSR = 150 K. The dotted vertical lines indicate the temperatures T1 and T2 corresponding to the region of the metastable state of coexistence of both phases. Arrows indicate the directions of temperature change. The insets schematically depict the directions of magnetisation of each of the iron sublattices relative to the crystallographic axes in each of the phases

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3. Fig. 2. Schematic of the phase diagram of ε-In0.04Fe1.96O3 nanoparticles in (θ, T) coordinates. The areas with inclined hatching correspond to each of the phases (WTF and NTP). The vertical lines indicate the temperatures T1 and T2 corresponding to the region of the metastable state of coexistence of both phases. Cross-hatching corresponds to this region. The overlapping boundaries of the coexistence regions at temperatures T1 and T2 are given by the expressions K1(T2) = 0 and K1(T1) + 2K2 = 0 (see boxes)

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4. Fig. 3. Fragments of temperature dependences of magnetisation of ε-In0.04Fe1.96O3 nanoparticles in the vicinity of temperature hysteresis measured in different magnetic fields. Arrows indicate the directions of temperature change. Solid lines show the approximations

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5. Fig. 4. Phase diagram of ε-In0.04Fe1.96O3 nanoparticles in (γ, T) coordinates. Arrows indicate the directions of temperature change. The vertical dashed lines indicate the temperatures T1/2↓ and T1/2↑, at which γ = 0.5 (marked by the horizontal dashed line) corresponds to the equilibrium of WTF and NTP. The difference T1/2↑ - T1/2↓ is the temperature hysteresis width of the spin reorientation ΔT. Field dependence of the spin reorientation temperature shift ΔT(H). The solid line shows the approximation by a linear function

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