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VIDEO DOI: https://doi.org/10.48448/kz46-3259

technical paper

MMM 2022

November 07, 2022

Minneapolis, United States

Probing magnetic anisotropy and spin reorientation transition in 3D antiferromagnet, Ho0.5Dy0.5FeO3 │Pt using spin Hall magnetoresistance

Orthoferrites (REFeO3) containing rare-earth (RE) elements are 3D antiferromagnets (AFM) that exhibit characteristic weak ferromagnetism originating due to slight canting of the spin moments and display a rich variety of spin reorientation transitions in the magnetic field (H)-temperature (T) parameter space (1, 2). We present spin Hall magnetoresistance (SMR) studies (3) on a b-plate (ac-plane) of crystalline Ho0.5Dy0.5FeO3│Pt hybrid at various T in the range, 11 to 300 K. In the room temperature Γ4(Gx, Ay, Fz) phase, the switching between two degenerate domains, Γ4(+Gx, +Fz) and Γ4(-Gx, -Fz) occurs at fields above a critical value, Hc ≈ 713 Oe. Under H > Hc, the angular dependence of SMR (α-scan) in the Γ4(Gx, Ay, Fz) phase yielded a highly skewed curve with a sharp change (sign-reversal) along with a rotational hysteresis around a-axis. This hysteresis decreases with an increase in H (Fig.1). Notably, at H < Hc, the α-scan measurements on the single domain, Γ4(± Gx, ± Fz) exhibited an anomalous sinusoidal signal of periodicity 360 deg. Low-T SMR curves (H = 2.4 kOe), showed a systematic narrowing of the hysteresis (down to 150 K) and a gradual reduction in the skewness (150 to 52 K), suggesting weakening of the anisotropy possibly due to the T-evolution of Fe-RE exchange coupling. Below 25 K, the SMR modulation showed an abrupt change around the c-axis, marking the presence of Γ2(Fx,Cy,Gz) phase. We have employed a simple Hamiltonian and computed SMR to examine the observed skewed SMR modulation. In summary, SMR is found to be an effective tool to probe magnetic anisotropy as well as a spin reorientation in Ho0.5Dy0.5FeO3. Our spin-transport study highlights the potential of Ho0.5Dy0.5FeO3 for future AFM spintronic devices.

(1) T. Yamaguchi, J. Phys. Chem. Solids, Vol. 35, p.479 (1974)
(2) T. Chakraborty and S. Elizabeth, J. Magn. Magn. Mater., vol. 462, p. 78 (2018)
(3) Y.-T. Chen, S. Takahashi, H. Nakayama, Phys. Rev. B, vol. 87, p. 144411 (2013)


Transcript English (automatic)

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