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Tuning ferrimagnetism in Co1.5Fe1.5O4 by Ag ion irradiation: a structural and X-ray magnetic circular dichroism study
Pushpalatha Jagarlamudi1, Pujarani Parida1, Debapriya Nayak1
1Department of Physics, School of Advanced Sciences, VIT-AP University, Amaravati 522241, Andhra Pradesh, India. virendra.verma@vitap.ac.in.
Abstract:
Swift heavy ion irradiation provides an effective method for defect-mediated regulation of magnetic functionality in oxide materials. In this work, 100 MeV Ag ions were used to systematically modify the structural and magnetic properties of Co1.5Fe1.5O4, prepared via the solution combustion method, at different fluences: 0, 1 × 1013, and 1 × 1014 ions per cm2. Ion irradiation improves the orbital magnetic contribution and ferrimagnetic ordering by altering the defect chemistry, causing cation redistribution, and strengthening superexchange interactions. These results show the potential of irradiated Co1.5Fe1.5O4 for enhanced magnetic recording, spintronic, and environmental applications, and offer essential insight into ion-beam-controlled magnetic tuning. We described the structural, morphological, magnetic, and electronic properties of the irradiated Co1.5Fe1.5O4 using angle-dispersive X-ray diffraction (ADXRD), high-resolution transmission electron microscopy (HRTEM), vibrating sample magnetometry (VSM), X-ray absorption spectroscopy (XAS), and X-ray magnetic circular dichroism (XMCD). ADXRD confirmed the inverse cubic spinel structure of these ferrites before and after the heavy ion impact. VSM analysis revealed enhanced magnetic saturation and coercivity with higher Ag ion fluences. The overall magnetic moment per Co1.5Fe1.5O4 unit cell increases from 1.38 to 2.56µB, indicating stronger ferrimagnetic alignment. Ion-induced anisotropic strain enhances orbital angular momentum, resulting in an increase in the orbital magnetic moment of the Fe ions at higher fluences. Ion impact tunes the magnetic properties of Co1.5Fe1.5O4 by creating defects, making it suitable for applications in magnetic recording media, magnetic storage devices, wastewater treatment, and spintronics.
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