A paradigm of topological-microstructure-transition induced magnetic critical behaviors in percolative nanocomposites

Tang，Yu1,3; Xiao，Bin3,4; Gu，Jian3; Wang，Ruixin1; Zhang，Yi2; Li，Shun1; Du，Piyi3

2020-03-01

10.1016/j.jmmm.2019.166056

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   影响因子和分区

0304-8853

1873-4766

A study on the magnetic properties of the BaTiO(BTO)-NiZnFeO(NZFO) nanocomposite thin films is presented to reveal the effect of percolation and resultant topological-microstructure-transition on the magnetic properties of the nanocomposites, which exhibit a critical behavior at the percolation threshold f. An in-depth analysis was conducted from the perspectives of chemistry and physics both experimentally and theoretically by considering the microstructure and magnetic parameters of the nanocomposites. The results show that the anomalous behavior of the coercivity is jointly controlled by the exchange interaction between the ferrite nanoparticles and the grain size associated with the topological microstructure and composition of the nanocomposites. When the NZFO content is below the percolation threshold, the coercivity is mainly controlled by grain size, and the permeability is controlled by the equivalent demagnetizing field. When the NZFO content is above the percolation threshold, the coercivity is jointly affected by exchange interaction and grain size, while the suppression of the permeability by the equivalent demagnetizing field is greatly reduced. The findings may help establish a new paradigm of topological-microstructure-transition induced magnetic critical behaviors of percolative functional composites, and more and more evidences suggest that such effect may widely exist in various percolative systems.

Coercivity Ferroelectric-ferrimagnetic composite Nano effect Percolation effect

SCI ; EI

英语

其他

National Natural Science Foundation of China[51701237] ; National Natural Science Foundation of China[51772269] ; National Natural Science Foundation of China[51802345]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Condensed Matter

WOS:000501596800005

Elsevier B.V.

20194407604528

Barium titanate ; Chemical analysis ; Coercive force ; Exchange interactions ; Grain size and shape ; Magnetism ; Microstructure ; Nanocomposites ; Percolation (computer storage) ; Percolation (fluids) ; Solvents ; Topology

Magnetism: Basic Concepts and Phenomena:701.2 ; Semiconducting Materials:712.1 ; Data Storage, Equipment and Techniques:722.1 ; Nanotechnology:761 ; Chemical Agents and Basic Industrial Chemicals:803 ; Inorganic Compounds:804.2 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Atomic and Molecular Physics:931.3 ; Solid State Physics:933 ; Materials Science:951

PHYSICS

2-s2.0-85074096064

Scopus

1.Department of Materials Science and EngineeringCollege of Aerospace Science and EngineeringNational University of Defense Technology,Changsha,410073,China
2.Department of PhysicsCollege of Liberal Arts and SciencesNational University of Defense Technology,Changsha,410073,China
3.State Key Laboratory of Silicon MaterialsSchool of Materials Science and EngineeringZhejiang University,Hangzhou,310027,China
4.Department of Materials Science and EngineeringShenzhen Engineering Research Center for Novel Electronic Information Materials and DevicesSouthern University of Science and Technology,Shenzhen,518055,China

Tang，Yu,Xiao，Bin,Gu，Jian,et al. A paradigm of topological-microstructure-transition induced magnetic critical behaviors in percolative nanocomposites[J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,2020,497.

Tang，Yu.,Xiao，Bin.,Gu，Jian.,Wang，Ruixin.,Zhang，Yi.,...&Du，Piyi.(2020).A paradigm of topological-microstructure-transition induced magnetic critical behaviors in percolative nanocomposites.JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,497.

Tang，Yu,et al."A paradigm of topological-microstructure-transition induced magnetic critical behaviors in percolative nanocomposites".JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 497(2020).