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Magnetic properties of an isolated ferromagnetic bond embedded in Heisenberg antiferromagnets

The magnetic properties of an isolated ferromagnetic bond of coupling constant K embedded in a layered spin‐1/2 Heisenberg antiferromagnet with interplane coupling strength J ⊥=αJ ∥ (0≤α≤1.0) have been studied using linear‐spin‐wave (LSW) theory. In the pure lattice, the sublattice magnetization 〈S z i 〉 is 0.304 at α=0 and saturates to 0.422 at α=1.0. The spin correlations 〈S x i S x j 〉 decrease with increasing α within the plane and increase along the interplane direction. The introduction of an isolated ferromagnetic bond into the host lattice tends to enhance 〈S z i 〉 at lattice sites joining the bond as K approaches zero. Increasing K will drastically suppress 〈S x i S x j 〉 across the bond. Whereas, 〈S x i S x j 〉 is enhanced between the neighboring sites close to the impurity link resulting in the suppression of 〈S z i 〉. This behavior persists for all α values. The LSW theory breaks down at a certain K value. Increasing α, the critical value of K extends to a larger number.