Idioma:

Ferromagnetism in suspensions of magnetic platelets in liquid crystal

MERTELJ, Alenka ; LISJAK, Darja ; DROFENIK, Miha ; COPIC, Martin

Nature (London), 2013-12, Vol.504 (7479), p.237-241 [Periódico revisado por pares]

London: Nature Publishing Group

Texto completo disponível

Citações Citado por

Enviar para

Título:
Ferromagnetism in suspensions of magnetic platelets in liquid crystal
Autor: MERTELJ, Alenka ; LISJAK, Darja ; DROFENIK, Miha ; COPIC, Martin
Assuntos: Colloids ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Cooling ; Defects ; Exact sciences and technology ; Ferromagnetic phases ; Ferromagnetism ; Liquid crystals ; Magnetic fields ; Magnetic liquids ; Magnetic properties ; Magnetic properties and materials ; Magnetism ; Magnetization ; Nanoparticles ; Nematic ; Phase transitions ; Physics ; Platelets ; Studies of specific magnetic materials ; Suspensions (Chemistry) ; Symmetry
É parte de: Nature (London), 2013-12, Vol.504 (7479), p.237-241
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: More than four decades ago, Brochard and de Gennes proposed that colloidal suspensions of ferromagnetic particles in nematic (directionally ordered) liquid crystals could form macroscopic ferromagnetic phases at room temperature. The experimental realization of these predicted phases has hitherto proved elusive, with such systems showing enhanced paramagnetism but no spontaneous magnetization in the absence of an external magnetic field. Here we show that nanometre-sized ferromagnetic platelets suspended in a nematic liquid crystal can order ferromagnetically on quenching from the isotropic phase. Cooling in the absence of a magnetic field produces a polydomain sample exhibiting the two opposing states of magnetization, oriented parallel to the direction of nematic ordering. Cooling in the presence of a magnetic field yields a monodomain sample; magnetization can be switched by domain wall movement on reversal of the applied magnetic field. The ferromagnetic properties of this dipolar fluid are due to the interplay of the nematic elastic interaction (which depends critically on the shape of the particles) and the magnetic dipolar interaction. This ferromagnetic phase responds to very small magnetic fields and may find use in magneto-optic devices.
Editor: London: Nature Publishing Group
Idioma: Inglês

Links

Voltar para lista de resultados

Realização: Logos de Redes Sociais:

Ferromagnetism in suspensions of magnetic platelets in liquid crystal

MERTELJ, Alenka ; LISJAK, Darja ; DROFENIK, Miha ; COPIC, Martin

London: Nature Publishing Group

Buscando em bases de dados remotas. Favor aguardar.