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2015 ; 112
(47
): 14484-9
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Self-assembly of smallest magnetic particles
#MMPMID26554000
Mehdizadeh Taheri S
; Michaelis M
; Friedrich T
; Förster B
; Drechsler M
; Römer FM
; Bösecke P
; Narayanan T
; Weber B
; Rehberg I
; Rosenfeldt S
; Förster S
Proc Natl Acad Sci U S A
2015[Nov]; 112
(47
): 14484-9
PMID26554000
show ga
The assembly of tiny magnetic particles in external magnetic fields is important
for many applications ranging from data storage to medical technologies. The
development of ever smaller magnetic structures is restricted by a size limit,
where the particles are just barely magnetic. For such particles we report the
discovery of a kind of solution assembly hitherto unobserved, to our knowledge.
The fact that the assembly occurs in solution is very relevant for applications,
where magnetic nanoparticles are either solution-processed or are used in liquid
biological environments. Induced by an external magnetic field, nanocubes
spontaneously assemble into 1D chains, 2D monolayer sheets, and large 3D cuboids
with almost perfect internal ordering. The self-assembly of the nanocubes can be
elucidated considering the dipole-dipole interaction of small superparamagnetic
particles. Complex 3D geometrical arrangements of the nanodipoles are obtained
under the assumption that the orientation of magnetization is freely adjustable
within the superlattice and tends to minimize the binding energy. On that basis
the magnetic moment of the cuboids can be explained.