Positive temperature coefficient of magnetic anisotropy in polyvinylidene fluoride (PVDF)-based magnetic composites

Yiwei Liu; Baomin Wang; Qingfeng Zhan; Zhenhua Tang; Huali Yang; Gang Liu; Zhenghu Zuo; Xiaoshan Zhang; Yali Xie; Xiaojian Zhu; Bin Chen; Junling Wang; Run-Wei Li

doi:10.1038/srep06615

Positive temperature coefficient of magnetic anisotropy in polyvinylidene fluoride (PVDF)-based magnetic composites

Yiwei Liu
, Baomin Wang^*
, Qingfeng Zhan
, Zhenhua Tang
, Huali Yang
, Gang Liu
, Zhenghu Zuo
, Xiaoshan Zhang
, Yali Xie
, Xiaojian Zhu
, Bin Chen
, Junling Wang
, Run-Wei Li

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

40 Citations (Scopus)

9 Downloads (CityUHK Scholars)

Abstract

The magnetic anisotropy is decreased with increasing temperature in normal magnetic materials, which is harmful to the thermal stability of magnetic devices. Here, we report the realization of positive temperature coefficient of magnetic anisotropy in a novel composite combining β-phase polyvinylidene fluoride (PVDF) with magnetostrictive materials (magnetostrictive film/PVDF bilayer structure). We ascribe the enhanced magnetic anisotropy of the magnetic film at elevated temperature to the strain-induced anisotropy resulting from the anisotropic thermal expansion of the β-phase PVDF. The simulation based on modified Stoner-Wohlfarth model and the ferromagnetic resonance measurements confirms our results. The positive temperature coefficient of magnetic anisotropy is estimated to be 1.1 × 10² J m^-3 K^-1. Preparing the composite at low temperature can enlarge the temperature range where it shows the positive temperature coefficient of magnetic anisotropy. The present results may help to design magnetic devices with improved thermal stability and enhanced performance.

Original language	English
Article number	6615
Journal	Scientific Reports
Volume	4
DOIs	https://doi.org/10.1038/srep06615
Publication status	Published - 14 Oct 2014
Externally published	Yes

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title = "Positive temperature coefficient of magnetic anisotropy in polyvinylidene fluoride (PVDF)-based magnetic composites",

abstract = "The magnetic anisotropy is decreased with increasing temperature in normal magnetic materials, which is harmful to the thermal stability of magnetic devices. Here, we report the realization of positive temperature coefficient of magnetic anisotropy in a novel composite combining β-phase polyvinylidene fluoride (PVDF) with magnetostrictive materials (magnetostrictive film/PVDF bilayer structure). We ascribe the enhanced magnetic anisotropy of the magnetic film at elevated temperature to the strain-induced anisotropy resulting from the anisotropic thermal expansion of the β-phase PVDF. The simulation based on modified Stoner-Wohlfarth model and the ferromagnetic resonance measurements confirms our results. The positive temperature coefficient of magnetic anisotropy is estimated to be 1.1 × 102 J m-3 K-1. Preparing the composite at low temperature can enlarge the temperature range where it shows the positive temperature coefficient of magnetic anisotropy. The present results may help to design magnetic devices with improved thermal stability and enhanced performance.",

author = "Yiwei Liu and Baomin Wang and Qingfeng Zhan and Zhenhua Tang and Huali Yang and Gang Liu and Zhenghu Zuo and Xiaoshan Zhang and Yali Xie and Xiaojian Zhu and Bin Chen and Junling Wang and Run-Wei Li",

note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].",

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TY - JOUR

T1 - Positive temperature coefficient of magnetic anisotropy in polyvinylidene fluoride (PVDF)-based magnetic composites

AU - Liu, Yiwei

AU - Wang, Baomin

AU - Zhan, Qingfeng

AU - Tang, Zhenhua

AU - Yang, Huali

AU - Liu, Gang

AU - Zuo, Zhenghu

AU - Zhang, Xiaoshan

AU - Xie, Yali

AU - Zhu, Xiaojian

AU - Chen, Bin

AU - Wang, Junling

AU - Li, Run-Wei

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2014/10/14

Y1 - 2014/10/14

N2 - The magnetic anisotropy is decreased with increasing temperature in normal magnetic materials, which is harmful to the thermal stability of magnetic devices. Here, we report the realization of positive temperature coefficient of magnetic anisotropy in a novel composite combining β-phase polyvinylidene fluoride (PVDF) with magnetostrictive materials (magnetostrictive film/PVDF bilayer structure). We ascribe the enhanced magnetic anisotropy of the magnetic film at elevated temperature to the strain-induced anisotropy resulting from the anisotropic thermal expansion of the β-phase PVDF. The simulation based on modified Stoner-Wohlfarth model and the ferromagnetic resonance measurements confirms our results. The positive temperature coefficient of magnetic anisotropy is estimated to be 1.1 × 102 J m-3 K-1. Preparing the composite at low temperature can enlarge the temperature range where it shows the positive temperature coefficient of magnetic anisotropy. The present results may help to design magnetic devices with improved thermal stability and enhanced performance.

AB - The magnetic anisotropy is decreased with increasing temperature in normal magnetic materials, which is harmful to the thermal stability of magnetic devices. Here, we report the realization of positive temperature coefficient of magnetic anisotropy in a novel composite combining β-phase polyvinylidene fluoride (PVDF) with magnetostrictive materials (magnetostrictive film/PVDF bilayer structure). We ascribe the enhanced magnetic anisotropy of the magnetic film at elevated temperature to the strain-induced anisotropy resulting from the anisotropic thermal expansion of the β-phase PVDF. The simulation based on modified Stoner-Wohlfarth model and the ferromagnetic resonance measurements confirms our results. The positive temperature coefficient of magnetic anisotropy is estimated to be 1.1 × 102 J m-3 K-1. Preparing the composite at low temperature can enlarge the temperature range where it shows the positive temperature coefficient of magnetic anisotropy. The present results may help to design magnetic devices with improved thermal stability and enhanced performance.

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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84946145762&origin=recordpage

U2 - 10.1038/srep06615

DO - 10.1038/srep06615

M3 - RGC 21 - Publication in refereed journal

C2 - 25311047

SN - 2045-2322

VL - 4

JO - Scientific Reports

JF - Scientific Reports

M1 - 6615

ER -

Positive temperature coefficient of magnetic anisotropy in polyvinylidene fluoride (PVDF)-based magnetic composites

Abstract

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