dc.creatorVargas, Nicolás M.
dc.creatorTorres, Felipe
dc.creatorBaker, Alexander A.
dc.creatorLee, Jonathan R. I.
dc.creatorKiwi Tichauer, Miguel
dc.creatorWilley, Trevor M.
dc.creatorMonton, Carlos
dc.creatorSchuller, Iván K.
dc.date.accessioned2021-06-07T14:08:34Z
dc.date.available2021-06-07T14:08:34Z
dc.date.created2021-06-07T14:08:34Z
dc.date.issued2020
dc.identifierApplied Physics Letters Volumen: 117 Número: 21 Número de artículo: 213105 Nov 2020
dc.identifier10.1063/5.0022926
dc.identifierhttps://repositorio.uchile.cl/handle/2250/179991
dc.description.abstractWe have compared the magnetic properties of well-controlled ultra-short (<= 50nm) atomic iron (Fe) chains embedded in Fe-phthalocyanine films with those in Fe-hydrogen (H-2) phthalocyanine superlattices. Surprisingly, we found that the coercivity of the atomic chains with free boundary conditions is independent of the chain length, whereas the one subject to hybridization of the chain ends exhibits an unexpected length dependence. These findings suggest that ferromagnetism in the free-boundary condition system is caused by an intrinsic indirect exchange. On the other hand, controlled boundary conditions produce a helical spin structure due to an extrinsic indirect exchange, which arises from the interaction between iron atoms at the ends of the chain and the hydrogen in the H-2 phthalocyanine spacer. As a consequence, during magnetic reversal, ultra-short iron chains subject to boundary clamping develop a helical spin structure, leading to increased coercivity. These findings suggest unique insights and ideas for the design of atomic-scale ultra-dense magnetic storage nanodevices.
dc.languageen
dc.publisherAmerican Institute of Physics
dc.sourceApplied Physics Letters
dc.subjectQuantum criticality
dc.subjectFerromagnetism
dc.titleHelical spin structure in iron chains with hybridized boundaries
dc.typeArtículo de revista


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