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We present calculations of electronic and magnetic structures ofvanadium-benzene multidecker clusters V$_{n}$Bz$_{n+1}$ ($n$ = 1 - 3) usingadvanced quantum Monte Carlo methods. These and related systems have beenidentified as prospective spin filters in spintronic applications, assumingthat their ground states are half-metallic ferromagnets. Although we find thatmagnetic properties of these multideckers are consistent with ferromagneticcoupling, their electronic structures do not appear to be half-metallic aspreviously assumed. In fact, they are ferromagnetic insulators with large andbroadly similar $\uparrow$-/$\downarrow$-spin gaps. This makes the potential ofthese and related materials as spin filtering devices very limited, unless theyare further modified or functionalized.

Quantum Monte Carlo study of one-dimensional transition metal organometallic cluster systems and their suitability as spin filters