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Reentrant Spin Glass and Large Coercive Field Observed in a Spin Integer Dimerized Honeycomb Lattice
Author(s) -
Zhai YuanQi,
Deng YiFei,
Fu Zhendong,
Feng Erxi,
Su Yixi,
Shiga Takuya,
Oshio Hiroki,
Zheng YanZhen
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202004744
Subject(s) - condensed matter physics , spin canting , materials science , antiferromagnetism , spin glass , coercivity , lattice constant , van der waals force , magnetic field , magnetization , physics , diffraction , optics , quantum mechanics , molecule
2D magnetic materials with dimerized honeycomb lattices can be treated as mixed‐spin square lattices, in which a quantum phase transition may occur to realize the Bose–Einstein condensation of magnons under reachable experimental conditions. However, this has never been successfully realized with integer spin centers. Herein, a spin integer ( S = 2) dimerized honeycomb lattice in an iron(II)‐azido compound [Fe(4‐etpy) 2 (N 3 ) 2 ] n (FEN, 4‐etpy = 4‐ethylpyridine) is realized. Morphology characterization by transmission electron microscopy, scanning electron microscopy, and atomic force microscopy spectroscopies show that the thinnest place of the sample is ≈13 nm, which is equal to ten layers of the compound. In contrast to the common magnetic properties of long‐range magnetic ordering, Mössbauer and polarized neutron scattering studies reveal that FEN exhibits a reentrant spin glass behavior owing to competing ferro‐ and antiferromagnetic exchange‐coupling interactions within the lattice. Two spin glass phases with disparate canting angles are characterized at 39 and 28 K, respectively. By using Curély's model, two exchange‐coupling constants ( J 1 = +35.8 cm −1 and J 2 = −3.7 cm −1 ) can be simulated. Moreover, a very large coercive field of ≈1.9 Tesla is observed at 2 K, making FEN a “very hard” van der Waals 2D magnetic material.