Volume 125, Number 4, February 2019
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||22 March 2019|
Ferromagnetism evidence and size dependence in ferroelectric PZN-4.5PT nanoparticles
1 Laboratoire de Chimie et de Physique des Matériaux (LCPM), University, Assane Seck of Ziguinchor (UASZ) Quartier Néma 2, BP 523, Ziguinchor, Senegal
2 Inserm, U1148, Laboratory for Vascular Translational Science, Université Paris 13, Sorbonne Paris Cité F-93017 Bobigny, France
3 Univ Lyon, INSA- Lyon, LGEF, EA682 - 8 rue de la Physique, F-69621, Villeurbanne, France
4 Institute for Nuclear Sciences Vinca, University of Belgrade - Mike Petrovica Alasa 12-14 POB 522, 11351 Vinca, Belgrade, Serbia
5 ESRF - 71 Avenue des Martyrs, F-38000 Grenoble, France
Received: 8 November 2018
Accepted: 14 February 2019
In this work we show the size-dependent ferromagnetic behavior of undoped and Mn-doped PZN-4.5PT single crystals, consequently their multiferroic one. Undoped single crystals were tamisized and three different sizes powders were investigated showing a size dependence in such ferroelectric materials while no magnetism is observed for the non-oriented and oriented bulk single crystals. The results show the existence of an optimized grain sizes range () in which the magnetism is the highest (around 0.08 emu/g). It is found that the maximum value of the relative strain decreases from 0.25% for undoped crystals to 0.20% for Mn-doped ones. The remanent magnetization and coercivity () were found equal, respectively, to and 63 Oe for undoped and, and 66 Oe for Mn-doped PZN-4.5PT indicating that PZN-4.5PT particles possessed weak ferromagnetic behavior. Mn doping increases highly the spontaneous magnetization from to , respectively for undoped and Mn-doped nanoparticles.
PACS: 75.75.-c – Magnetic properties of nanostructures / 77.55.Nv – Multiferroic/magnetoelectric films / 77.80.-e – Ferroelectricity and antiferroelectricity
© EPLA, 2019
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