{Sc_nGd_n} Heterometallic Rings: Tunable Ring Topology for Spin-Wave Excitations

Abstract

Data carriers using spin waves in spintronic and magnonic logic devices offer operation at low power consumption and free of Joule heating yet requiring noncollinear spin structures of small sizes. Heterometallic rings can provide such an opportunity due to the controlled spin-wave transmission within such a confined space. Here, we present a series of {Sc n Gd n } (n = 4, 6, 8) heterometallic rings, which are the first Sc–Ln clusters to date, with tunable magnetic interactions for spin-wave excitations. By means of time- and temperature-dependent spin dynamics simulations, we are able to predict distinct spin-wave excitations at finite temperatures for Sc 4 Gd 4 , Sc 6 Gd 6 , and Sc 8 Gd 8 . Such a new model is previously unexploited, especially due to the interplay of antiferromagnetic exchange, dipole–dipole interaction, and ring topology at low temperatures, rendering the importance of the latter to spin-wave excitations.

Two solvent-dependent Al16 nanorings: design, synthesis and nonlinear optical limiting behavior

“…Usually, higher α and β values and lower OL values are key parameters for considering optical limiting performance. These values are not as good as those of some porphyrins and phthalocyanine materials, such as 2,9(10),16 (17),23(24)-tetrakis-(4-pyridyloxy) phthalocyaninato (H 2 TPPc) with detonation nanodiamonds in DMSO and single-walled carbon nanotube-5,10,15,20-tetraphenylporphyrin (SWN 7 -TPP) in DMF, but superior to those of some known transition metal cluster materials, which include but are not limited to, KBr-based AgSn 12 cluster thin films, graphene oxide (GO) in DMF and [(Tp*WS 3 Cu 3 ) 4 (μ 4 -S) 4 (Ag)]OTf (3@PVBC) thin films (Fig. 4e and Table S9 †).…”

“…[13][14][15] Furthermore, heterometallic 3d-4f molecular rings are also the stars of hybrid molecular rings, such as Cr 4 Dy 4 , Sc 8 Gd 8 , and Mo 128 Ce 4 with modified delta-chain structures, which are linked via benzoates. [16][17][18] These macrocyclic molecules exhibit distinct benefits in the optics, magnetism and host-guest chemistry domains. [19][20][21][22][23] Yang et al reported a {Nd 18 } molecular ring exhibiting NIR luminescence sensing of antibiotics.…”

Recent advances in polyoxometalate-based lanthanide–oxo clusters

“…They not only exhibit fascinating topologies but also have unique properties that differrent from individual metal ions and lanthanide nanomaterials due to the synergistic and/or coupling interactions within the metal ions [7][8][9][10][11][12]. The outstanding advantage of metal clusters is their definite atomic composition and the well-defined geometrical structure, which can be modulated by changing the internal atoms and surface ligands [13][14][15][16][17]. Considerable efforts in this field have resulted in the fabrication of a large number of LnOCs based on organic ligands [18][19][20][21][22][23].…”

Double butterfly-shaped octanuclear dysprosium clusters: structure, magnetism and assembly mechanism

“…[8][9][10][11] In recent years, great progress has been made in mononuclear dysprosium complex based single-molecule magnets (SMMs) with a large flip energy barrier (U eff ) and high hysteresis temperature (T B ). [12][13][14][15][16][17][18] Mononuclear dysprosium complexes may represent the lower size limit of molecule based magnetic information storage materials, which may mean that high-nucleation dysprosium clusters can comprise SMMs with better performance. Therefore, high-nuclear dysprosium based SMMs will be a more promising direction in the field of molecular magnetism in the future.…”