Thermomagnetic Properties of Dy_0.9Ho_0.1MnO₃ Multiferroics

Abstract

Holmium (Ho)‐doped DyMnO3 multiferroic compound is prepared using conventional solid‐state reaction route, and X‐ray powder diffraction analysis is conducted to confirm the single‐phase structure. Coexistence of magnetic and electric behavior in case of multiferroics is analyzed by heat capacity measurements from low temperature (2 K) to room temperature (300 K) under different magnetic fields. Herein, the existence antiferromagnetic and ferroelectric phase transitions in this compound at <10, 18, and 40 K, respectively, is revealed, which are attributed to the structural ordering or alignment of Mn3+ ions and R3+ ions. The magnetocaloric effect of this sample is also studied from heat capacity measurements. A maximum magnetic entropy change (ΔS)M of ≈6.3 J kg−1 K−1 and adiabatic temperature change (ΔT)ad of 3–4 K is achieved in 0.1Ho‐doped compound for a magnetic field change of 5 T and useful for low‐temperature magnetic refrigeration applications.

Synthesis and Room Temperature Structural, Optical, Electrical Properties of Holmium Doped GdMn2O5 Multiferroics

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Enhanced Cryogenic Magnetocaloric Performance in Te Doped Dy2O3

“…Later, rare earth oxides (REO) materials have gone mainstream in magnetic, catalytic, optical, sensor, and cryogenic applications over the last few decades. [14][15][16][17][18][19][20][21][22] REO's are of high technical importance in the refrigeration domain because of their ability to experience isothermal entropy change when external stimuli such as an electric force, magnetic field, stress, or pressure are applied. [23][24][25] By switching one control parameter to another, several driving fields may produce greater thermal changes with a smaller magnetic field across a broad range of operating temperatures and remove hysteresis.…”