首页|Magnetic phase transition and continuous spin switching in a high-entropy orthoferrite single crystal
Magnetic phase transition and continuous spin switching in a high-entropy orthoferrite single crystal
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Rare-earth orthoferrite REFeO3(where RE is a rare-earth ion)is gaining interest.We created a high-entropy orthoferrite(Tm0.2Nd0.2Dy0.2Y0.2Yb0.2)FeO3(HEOR)by doping five RE ions in equimolar ratios and grew the single crystal by optical floating zone method.It strongly tends to form a single-phase structure stabilized by high configurational entropy.In the low-temperature region(11.6-14.4 K),the spin reorientation transition(SRT)of Γ2(Fx,Cy,Gz)-Γ24-Γ4(Gx,Ay,Fz)occurs.The weak ferromagnetic(FM)moment,which comes from the Fe sublattices distortion,rotates from the a-to c-axis.The two-step dynamic processes(Γ2-Γ24-Γ4)are iden-tified by AC susceptibility measurements.SRT in HEOR can be tuned in the range of 50-60000 Oe,which is an order of magnitude larger than that of orthoferrites in the peer system,making it a candidate for high-field spin sensing.Typical spin-switching(SSW)and continuous spin-switching(CSSW)effects occur under low magnetic fields due to the strong interac-tions between RE-Fe sublattices.The CSSW effect is tunable between 20-50 Oe,and hence,HEOR potentially can be applied to spin modulation devices.Furthermore,because of the strong anisotropy of magnetic entropy change(-ΔSm)and refrigeration capacity(RC)based on its high configurational entropy,HEOR is expected to provide a novel approach for refrigeration by altering the orientations of the crystallographic axes(anisotropic configurational entropy).
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