Imperial College London
Alternate

ProfessorSandrineHeutz

Faculty of Engineering, Department of Materials

Head of the Department of Materials
 
 
 
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Contact

 

+44 (0)20 7594 6727s.heutz

 
 
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Location

 

201.BRoyal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wu:2019:10.1002/adfm.201902550,
author = {Wu, Z and Robaschik, P and Fleet, L and Felton, S and aeppli, G and Heutz, S},
doi = {10.1002/adfm.201902550},
journal = {Advanced Functional Materials},
title = {Controlling ferromagnetic ground states and solitons in thin films and nanowires built from iron phthalocyanine chains},
url = {http://dx.doi.org/10.1002/adfm.201902550},
volume = {29},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Iron phthalocyanine (FePc) is a molecular semiconductor whose building blocks are one-dimensional ferromagnetic chains. We show that its optical and magnetic properties are controlled by the growth strategy, obtaining extremely high coercivities of over 1 T and modulating the exchange constant between 15 and 29 K through tuning the crystal phase by switching from thin films with controlled orientations, to ultralong nanowires. Magnetisation measurements are analysed using concepts and formulas with broad applicability to all one-dimensional ferromagnetic chains. They show that FePc is best described by a Heisenberg model with moments preferentially lying in the molecular planes. The chain Hamiltonian is very similar to that for the classic inorganic magnet CsNiF3, but with ferromagnetic rather than antiferromagnetic interchain interactions. The data at large magnetic fields are well-described by the soliton picture, where the dominant degrees of freedom are moving one-dimensional magnetic domain walls and at low temperatures and fields by the “super-Curie-Weiss” law characteristic of nearly one-dimensional xy and Heisenberg ferromagnets. The ability to control the molecular orientation and ferromagnetism of FePc systems, and produce them on flexible substrates, together with excellent transistor characteristics reported previously for phthalocyanine analogues, makes them potentially useful for magneto-optical and spintronic devices.
AU  - Wu,Z
AU  - Robaschik,P
AU  - Fleet,L
AU  - Felton,S
AU  - aeppli,G
AU  - Heutz,S
DO  - 10.1002/adfm.201902550
PY  - 2019///
SN  - 1616-301X
TI  - Controlling ferromagnetic ground states and solitons in thin films and nanowires built from iron phthalocyanine chains
T2  - Advanced Functional Materials
UR  - http://dx.doi.org/10.1002/adfm.201902550
UR  - http://hdl.handle.net/10044/1/69386
VL  - 29
ER  -
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