Surface and Microstructure Analysis of CoCrPt Film on RuCoCrX (X = Ti, Re) Intermediate Layers
The microstructural and magnetic properties of perpendicular anisotropic CoCrPt films deposited on Ru or RuCoCrX (X = Ti, Re) intermediate layers were studied. The <i>c</i>-axis of CoCrPt grains were promoted by (0002) textured RuCoCr, and RuCoCrX (X = Ti, Re) intermediate layers due to...
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MDPI AG
2020-04-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/10/4/263 |
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| author | Jai-Lin Tsai Jyun-You Chen Cheng Dai Ting-Wei Hsu Shi-Min Weng |
| author_facet | Jai-Lin Tsai Jyun-You Chen Cheng Dai Ting-Wei Hsu Shi-Min Weng |
| author_sort | Jai-Lin Tsai |
| collection | DOAJ |
| description | The microstructural and magnetic properties of perpendicular anisotropic CoCrPt films deposited on Ru or RuCoCrX (X = Ti, Re) intermediate layers were studied. The <i>c</i>-axis of CoCrPt grains were promoted by (0002) textured RuCoCr, and RuCoCrX (X = Ti, Re) intermediate layers due to smaller lattice misfit as compared to Ru. The narrower rocking width (Δθ<sub>50</sub> = 3.76°) in RuCoCrRe intermediate layer and CoCrPt shows higher out of plane coercivity (<i>H<sub>c</sub></i> = 6.2 kOe), magnetic anisotropy constant (<i>K<sub>u</sub></i> = 6.2 × 10<sup>6</sup> erg/cm<sup>3</sup>) and nucleation field (<i>H<sub>N</sub></i> = −2.8kOe) as compared to the Ru intermediate layer (<i>H<sub>c</sub></i> = 5.4 kOe, <i>K<sub>u</sub></i> = 5.9 × 10<sup>6</sup> erg/cm<sup>3</sup>, <i>H<sub>N</sub></i> = −1.6 kOe). The partial intergranular exchange decoupling of CoCrPt grains was observed. The grain boundaries oxides were formed by the residual oxygen in targets and sputtering processes. The minor Cr<sub>2</sub>O<sub>3</sub>, CoO, TiO<sub>2</sub>, ReO<sub>3</sub> oxides were investigated by surface analysis. Due to the minor oxides and Cr segregation at grains boundaries, the CoCrPt films present high coercivity. Samples CoCrPt/RuCoCr and CoCrPt/RuCoCrTi present a minimum at 45° but the values are much higher than the ideal Stoner-Wohlfarth theoretical value 0.5 which could be due to fewer natural oxides for magnetic grains separation. In sample CoCrPt/RuCoCrRe, there is an increase of intergranular interaction as indicated by the large asymmetry and the shift of the minimum at lower angles. |
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| language | English |
| last_indexed | 2024-03-10T20:46:13Z |
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| spelling | doaj.art-b231ad329cf84b49a543b98bda3c5f982023-11-19T20:20:44ZengMDPI AGCrystals2073-43522020-04-0110426310.3390/cryst10040263Surface and Microstructure Analysis of CoCrPt Film on RuCoCrX (X = Ti, Re) Intermediate LayersJai-Lin Tsai0Jyun-You Chen1Cheng Dai2Ting-Wei Hsu3Shi-Min Weng4Department 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, TaiwanThe microstructural and magnetic properties of perpendicular anisotropic CoCrPt films deposited on Ru or RuCoCrX (X = Ti, Re) intermediate layers were studied. The <i>c</i>-axis of CoCrPt grains were promoted by (0002) textured RuCoCr, and RuCoCrX (X = Ti, Re) intermediate layers due to smaller lattice misfit as compared to Ru. The narrower rocking width (Δθ<sub>50</sub> = 3.76°) in RuCoCrRe intermediate layer and CoCrPt shows higher out of plane coercivity (<i>H<sub>c</sub></i> = 6.2 kOe), magnetic anisotropy constant (<i>K<sub>u</sub></i> = 6.2 × 10<sup>6</sup> erg/cm<sup>3</sup>) and nucleation field (<i>H<sub>N</sub></i> = −2.8kOe) as compared to the Ru intermediate layer (<i>H<sub>c</sub></i> = 5.4 kOe, <i>K<sub>u</sub></i> = 5.9 × 10<sup>6</sup> erg/cm<sup>3</sup>, <i>H<sub>N</sub></i> = −1.6 kOe). The partial intergranular exchange decoupling of CoCrPt grains was observed. The grain boundaries oxides were formed by the residual oxygen in targets and sputtering processes. The minor Cr<sub>2</sub>O<sub>3</sub>, CoO, TiO<sub>2</sub>, ReO<sub>3</sub> oxides were investigated by surface analysis. Due to the minor oxides and Cr segregation at grains boundaries, the CoCrPt films present high coercivity. Samples CoCrPt/RuCoCr and CoCrPt/RuCoCrTi present a minimum at 45° but the values are much higher than the ideal Stoner-Wohlfarth theoretical value 0.5 which could be due to fewer natural oxides for magnetic grains separation. In sample CoCrPt/RuCoCrRe, there is an increase of intergranular interaction as indicated by the large asymmetry and the shift of the minimum at lower angles.https://www.mdpi.com/2073-4352/10/4/263perpendicular anisotropyintergrain interactioncoercivity |
| spellingShingle | Jai-Lin Tsai Jyun-You Chen Cheng Dai Ting-Wei Hsu Shi-Min Weng Surface and Microstructure Analysis of CoCrPt Film on RuCoCrX (X = Ti, Re) Intermediate Layers Crystals perpendicular anisotropy intergrain interaction coercivity |
| title | Surface and Microstructure Analysis of CoCrPt Film on RuCoCrX (X = Ti, Re) Intermediate Layers |
| title_full | Surface and Microstructure Analysis of CoCrPt Film on RuCoCrX (X = Ti, Re) Intermediate Layers |
| title_fullStr | Surface and Microstructure Analysis of CoCrPt Film on RuCoCrX (X = Ti, Re) Intermediate Layers |
| title_full_unstemmed | Surface and Microstructure Analysis of CoCrPt Film on RuCoCrX (X = Ti, Re) Intermediate Layers |
| title_short | Surface and Microstructure Analysis of CoCrPt Film on RuCoCrX (X = Ti, Re) Intermediate Layers |
| title_sort | surface and microstructure analysis of cocrpt film on rucocrx x ti re intermediate layers |
| topic | perpendicular anisotropy intergrain interaction coercivity |
| url | https://www.mdpi.com/2073-4352/10/4/263 |
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