Direct observation of the magnetic anisotropy of an Fe(II) spin crossover molecular thin film

Dale, Ashley S.; Yazdani, Saeed; Ekanayaka, Thilini K.; Mishra, Esha; Hu, Yuchen; Dowben, Peter A.; Freeland, John W.; Zhang, Jian; Cheng, Ruihua

doi:10.1088/2515-7639/ace21a

Title: Direct observation of the magnetic anisotropy of an Fe(II) spin crossover molecular thin film

Journal Article · 11 July 2023 · JPhys Materials

DOI: https://doi.org/10.1088/2515-7639/ace21a · OSTI ID:1989253

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Abstract In this work, we provide clear evidence of magnetic anisotropy in the local orbital moment of a molecular thin film based on the SCO complex [Fe(H ₂ B(pz) ₂ ) ₂ (bipy)] (pz = pyrazol−1−yl, bipy = 2,2′−bipyridine). Field dependent x-ray magnetic circular dichroism measurements indicate that the magnetic easy axis for the orbital moment is along the surface normal direction. Along with the presence of a critical field, our observation points to the existence of an anisotropic energy barrier in the high-spin state. The estimated nonzero coupling constant of ∼2.47 × 10 ⁻⁵ eV molecule ⁻¹ indicates that the observed magnetocrystalline anisotropy is mostly due to spin–orbit coupling. The spin- and orbital-component anisotropies are determined to be 30.9 and 5.04 meV molecule ⁻¹ , respectively. Furthermore, the estimated g factor in the range of 2.2–2.45 is consistent with the expected values. This work has paved the way for an understanding of the spin-state-switching mechanism in the presence of magnetic perturbations.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357

OSTI ID:: 1989253

Journal Information:: JPhys Materials, Journal Name: JPhys Materials Journal Issue: 3 Vol. 6; ISSN 2515-7639

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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