Magnetic properties of alpha-iron(II) phthalocyanine

Details Magnetic properties of alpha-iron(II) phthalocyanine Magnetic properties of alpha-iron(II) phthalocyanine

2002-05-28

arxiv.org/abs/cond-mat/0205587v1

Phys. Rev. B 66, 144410 (2002)

Physics

Condensed Matter

11 pages (revtex4) + 12 ps figures

Scientific paper

10.1103/PhysRevB.66.144410

We report on the magnetic properties of the supra-molecular compound iron(II) phthalocyanine in its alpha-form. dc- and ac-susceptometry measurements and Mossbauer experiments show that the iron atoms are strongly magnetically coupled into ferromagnetic Ising chains with very weak antiferromagnetic interchain coupling. The transition to 3D magnetic ordering below 10 K is hindered by the presence of impurities or other defects, by which the domain-wall arrangements along individual chains become gradually blocked/frozen, leading to a disordered 3D distribution of ferromagnetic chain segments. Below 5 K, field-cooled and zero-field-cooled magnetization measurements show strong irreversible behavior, attributed to pinning of the domain-walls by the randomly distributed defects in combination with the interchain coupling. High-field magnetization experiments reveal a canted arrangement of the moments in adjacent ferromagnetic chains.

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