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<p>We report a detailed compositional dependence of magnetic interactions in (1 − <i>x</i>) (Co<sub>3</sub>O<sub>4</sub>) + <i>x</i> (Co<sub>2</sub>TiO<sub>4</sub>) [0 ≤ <i>x</i> (wt.%) ≤ 100] two-phase oxide spinels. Variation of ferrimagnetic Néel temperature (T<sub>N</sub>) was observed within 53.5–47.4 K by varying the composition from <i>x</i> = 0.23 to 1.0. For T &lt; T<sub>N</sub>, the temperature dependence of dc susceptibilities curves (χ(T) vs T) in both zero-field-cooled (ZFC) and field-cooled (FC) measurements exhibited the magnetic-compensation (T<sub>COMP</sub>) phenomena due to the complete magnetization balance of tetrahedral and octahedral sublattices. Further, we noticed a gradual decrease in T<sub>COMP</sub> from 37.71 K to 31.74 K with increasing <i>x</i>. A high value of coercivity H<sub>C</sub> (~19 kOe for <i>x</i> = 0.23) and exchange bias H<sub>EB</sub> (≈ 887 Oe for <i>x</i> = 1.0) was observed below T<sub>N</sub>, which can be tuned with <i>x</i>. The plausible origins of the large H<sub>C</sub> and H<sub>EB</sub> and the associated magnetic interactions are presented.</p>

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Tunable exchange-bias and magnetic compensation temperature of two-phase spinel composites (1 − x) (Co3O4) + x (Co2TiO4)

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • S Nayak,
  • D Hazra,
  • Vaskuri C S Theja,
  • P K Roy,
  • V Karthikeyan,
  • S Thota

摘要

We report a detailed compositional dependence of magnetic interactions in (1 − x) (Co3O4) + x (Co2TiO4) [0 ≤ x (wt.%) ≤ 100] two-phase oxide spinels. Variation of ferrimagnetic Néel temperature (TN) was observed within 53.5–47.4 K by varying the composition from x = 0.23 to 1.0. For T < TN, the temperature dependence of dc susceptibilities curves (χ(T) vs T) in both zero-field-cooled (ZFC) and field-cooled (FC) measurements exhibited the magnetic-compensation (TCOMP) phenomena due to the complete magnetization balance of tetrahedral and octahedral sublattices. Further, we noticed a gradual decrease in TCOMP from 37.71 K to 31.74 K with increasing x. A high value of coercivity HC (~19 kOe for x = 0.23) and exchange bias HEB (≈ 887 Oe for x = 1.0) was observed below TN, which can be tuned with x. The plausible origins of the large HC and HEB and the associated magnetic interactions are presented.