Temperature Dependence and Microstructure Effects on Magnetic Properties of FePt(B, Ag, C) Film
A FePt(B, Ag, C) granular film was formed from post-annealed B<sub>4</sub>C(1.0 nm)/FePt(Ag, C) layers at a substrate temperature of 470 °C for 2 min. The 6 nm thick FePt(B, Ag, C) film demonstrates high perpendicular magnetic anisotropy (K<sub>u</sub> = 2.83 × 10<sup>7...
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doaj-af76299f5aba44438aa37f4ccc16f76f2021-02-08T00:00:52ZengMDPI AGNanomaterials2079-49912021-02-011141941910.3390/nano11020419Temperature Dependence and Microstructure Effects on Magnetic Properties of FePt(B, Ag, C) FilmJai-Lin Tsai0Shi-Min Weng1Cheng Dai2Jyun-You Chen3Xue-Chang Lu4Ting-Wei Hsu5Department of Materials Science and Engineering, National Chung Hsing University, Taichung 402, TaiwanDepartment of Materials Science and Engineering, National Chung Hsing University, Taichung 402, TaiwanDepartment of Materials Science and Engineering, National Chung Hsing University, Taichung 402, TaiwanDepartment of Materials Science and Engineering, National Chung Hsing University, Taichung 402, TaiwanDepartment of Materials Science and Engineering, National Chung Hsing University, Taichung 402, TaiwanDepartment of Materials Science and Engineering, National Chung Hsing University, Taichung 402, TaiwanA FePt(B, Ag, C) granular film was formed from post-annealed B<sub>4</sub>C(1.0 nm)/FePt(Ag, C) layers at a substrate temperature of 470 °C for 2 min. The 6 nm thick FePt(B, Ag, C) film demonstrates high perpendicular magnetic anisotropy (K<sub>u</sub> = 2.83 × 10<sup>7</sup> erg/cm<sup>3</sup> at 100 K) and out-of-plane coercivity (H<sub>c</sub> = 38.0 kOe at 100 K). The K<sub>u</sub> and out-of-plane H<sub>c</sub> are respectively increased from 38% and 46% between 350 K and 50 K. The sample with a thickness of 8 nm also shows a similar trend for magnetic properties; however, the tiny magnetization kink which may come from rare Fe-B or disordered FePt grains was observed in the easy axis loop. The intrinsic (ΔH<sub>int</sub> = 12.6 kOe) and extrinsic switching field distribution (ΔH<sub>ext</sub> = 1.62 kOe) were characterized by major and minor loops to correlate the microstructural grains. The coupled FePt grains grown on a single MgTiON grain were observed in a high-resolution transmission electron microstructure (HRTEM) image. This small intergranular exchange coupling was defined by estimating the magnetic cluster size (46.6 nm) from ΔH<sub>ext</sub> and the average grains size (28.2 nm) from TEM images. The temperature dependence of coercivity was fitted to further understand the magnetization reversal process. The lower microstructural parameter was evidenced in the imperfect grain morphology.https://www.mdpi.com/2079-4991/11/2/419perpendicular magnetic anisotropycoercivityswitching field distributionintergranular exchange couplingmagnetic cluster sizegrain size |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jai-Lin Tsai Shi-Min Weng Cheng Dai Jyun-You Chen Xue-Chang Lu Ting-Wei Hsu |
spellingShingle |
Jai-Lin Tsai Shi-Min Weng Cheng Dai Jyun-You Chen Xue-Chang Lu Ting-Wei Hsu Temperature Dependence and Microstructure Effects on Magnetic Properties of FePt(B, Ag, C) Film Nanomaterials perpendicular magnetic anisotropy coercivity switching field distribution intergranular exchange coupling magnetic cluster size grain size |
author_facet |
Jai-Lin Tsai Shi-Min Weng Cheng Dai Jyun-You Chen Xue-Chang Lu Ting-Wei Hsu |
author_sort |
Jai-Lin Tsai |
title |
Temperature Dependence and Microstructure Effects on Magnetic Properties of FePt(B, Ag, C) Film |
title_short |
Temperature Dependence and Microstructure Effects on Magnetic Properties of FePt(B, Ag, C) Film |
title_full |
Temperature Dependence and Microstructure Effects on Magnetic Properties of FePt(B, Ag, C) Film |
title_fullStr |
Temperature Dependence and Microstructure Effects on Magnetic Properties of FePt(B, Ag, C) Film |
title_full_unstemmed |
Temperature Dependence and Microstructure Effects on Magnetic Properties of FePt(B, Ag, C) Film |
title_sort |
temperature dependence and microstructure effects on magnetic properties of fept(b, ag, c) film |
publisher |
MDPI AG |
series |
Nanomaterials |
issn |
2079-4991 |
publishDate |
2021-02-01 |
description |
A FePt(B, Ag, C) granular film was formed from post-annealed B<sub>4</sub>C(1.0 nm)/FePt(Ag, C) layers at a substrate temperature of 470 °C for 2 min. The 6 nm thick FePt(B, Ag, C) film demonstrates high perpendicular magnetic anisotropy (K<sub>u</sub> = 2.83 × 10<sup>7</sup> erg/cm<sup>3</sup> at 100 K) and out-of-plane coercivity (H<sub>c</sub> = 38.0 kOe at 100 K). The K<sub>u</sub> and out-of-plane H<sub>c</sub> are respectively increased from 38% and 46% between 350 K and 50 K. The sample with a thickness of 8 nm also shows a similar trend for magnetic properties; however, the tiny magnetization kink which may come from rare Fe-B or disordered FePt grains was observed in the easy axis loop. The intrinsic (ΔH<sub>int</sub> = 12.6 kOe) and extrinsic switching field distribution (ΔH<sub>ext</sub> = 1.62 kOe) were characterized by major and minor loops to correlate the microstructural grains. The coupled FePt grains grown on a single MgTiON grain were observed in a high-resolution transmission electron microstructure (HRTEM) image. This small intergranular exchange coupling was defined by estimating the magnetic cluster size (46.6 nm) from ΔH<sub>ext</sub> and the average grains size (28.2 nm) from TEM images. The temperature dependence of coercivity was fitted to further understand the magnetization reversal process. The lower microstructural parameter was evidenced in the imperfect grain morphology. |
topic |
perpendicular magnetic anisotropy coercivity switching field distribution intergranular exchange coupling magnetic cluster size grain size |
url |
https://www.mdpi.com/2079-4991/11/2/419 |
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