Ligand field design enables quantum manipulation of spins in Ni<sup>2+</sup> complexes

Wojnar, Michael K.; Kundu, Krishnendu; Kairalapova, Arailym; Wang, Xiaoling; Ozarowski, Andrew; Berkelbach, Timothy C.; Hill, Stephen; Freedman, Danna E.

doi:10.1039/d3sc04919a

Cited by 2 publications

(1 citation statement)

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“…The use of the term compressed is by analogy with homoleptic complexes, where compression of two bonds relative to the others will cause a similar splitting of the d orbital levels, and does not imply anything about the relative bond lengths. For d 8 Ni(II) this leads to a strong easy-axis (Ising) type anisotropy, ,− and for d 6 Fe(II) this tends to produce an easy-plane (XY) type anisotropy. , As the true symmetry is below tetragonal, there will be additional small rhombic anisotropy, E , neglected in this approximate treatment. There are two key parameters: the angle between the easy-axis and the M–M vector, ϕ, and the strength of the single ion anisotropy D (Figure ).…”

Section: Discussionmentioning

confidence: 99%

Controlling Noncollinear Ferromagnetism in van der Waals Metal–Organic Magnets

Pitcairn,

Ongkiko,

Iliceto

et al. 2024

J. Am. Chem. Soc.

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Van der Waals (vdW) magnets both allow exploration of fundamental 2D physics and offer a route toward exploiting magnetism in next generation information technology, but vdW magnets with complex, noncollinear spin textures are currently rare. We report here the syntheses, crystal structures, magnetic properties and magnetic ground states of four bulk vdW metal−organic magnets (MOMs): FeCl 2 (pym), FeCl 2 (btd), NiCl 2 (pym), and NiCl 2 (btd), pym = pyrimidine and btd = 2,1,3benzothiadiazole. Using a combination of neutron diffraction and bulk magnetometry we show that these materials are noncollinear magnets. Although only NiCl 2 (btd) has a ferromagnetic ground state, we demonstrate that low-field hysteretic metamagnetic transitions produce states with net magnetization in zero-field and high coercivities for FeCl 2 (pym) and NiCl 2 (pym). By combining our bulk magnetic data with diffuse scattering analysis and broken-symmetry density-functional calculations, we probe the magnetic superexchange interactions, which when combined with symmetry analysis allow us to suggest design principles for future noncollinear vdW MOMs. These materials, if delaminated, would prove an interesting new family of 2D magnets.

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