S. Bijaksana, Gian Megantara, Christopher Muchtar, M. Arandi, S. J. Fajar
{"title":"Identification of magnetic coercivity components in natural substances using Max Unmix web-application","authors":"S. Bijaksana, Gian Megantara, Christopher Muchtar, M. Arandi, S. J. Fajar","doi":"10.53533/jma.v2i1.17","DOIUrl":"https://doi.org/10.53533/jma.v2i1.17","url":null,"abstract":"Identification of magnetic minerals in rocks and other natural substances (sediments, ashes, soils, etc.) is important in Earth sciences. Such identification often uses a measurement of the IRM (isothermal remanent magnetization) acquisition curve that in turn provides the coercivity spectrum of the sample. In this study, MAX Unmix web-based application was used to unmix the coercivity spectrum of 13 natural samples to obtain their coercivity components. Digitized IRM acquisition data were inputted into the application, then adjusted specific parameters to obtain a best-fit coercivity spectrum revealing coercivity components. As a result, two to three components are generally identified for each sample. MAX Unmix application is highly recommended in future studies requiring the identification of magnetic minerals in natural substances.","PeriodicalId":360331,"journal":{"name":"Journal of Magnetism and Its Applications","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126948482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effect of Ni on Dielectric Properties of MnNi-Fe2O4 Magnetic Nanoparticles","authors":"Z. Zulkarnain, E. Suharyadi","doi":"10.53533/jma.v1i2.11","DOIUrl":"https://doi.org/10.53533/jma.v1i2.11","url":null,"abstract":"","PeriodicalId":360331,"journal":{"name":"Journal of Magnetism and Its Applications","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127701725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Haryati, K. Dahlan, Martina Bunga, Daniel Napitupulu, O. Togibasa
{"title":"Mineral Content and Magnetic Properties of River Iron Sand from Jayapura, Papua","authors":"E. Haryati, K. Dahlan, Martina Bunga, Daniel Napitupulu, O. Togibasa","doi":"10.53533/jma.v1i2.13","DOIUrl":"https://doi.org/10.53533/jma.v1i2.13","url":null,"abstract":"","PeriodicalId":360331,"journal":{"name":"Journal of Magnetism and Its Applications","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130126353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. L. Maghfirohtuzzoimah, S. H. Intifadhah, Pelangi Az-zahra, W. Klysubun, D. P. Sari, I. Watanabe, M. Zainuri, F. Astuti
{"title":"Local Structure and Magnetism of LiFeSi0.01P0.99O4/C as a Cathode Material on Lithium-Ion Battery","authors":"V. L. Maghfirohtuzzoimah, S. H. Intifadhah, Pelangi Az-zahra, W. Klysubun, D. P. Sari, I. Watanabe, M. Zainuri, F. Astuti","doi":"10.53533/jma.v1i1.6","DOIUrl":"https://doi.org/10.53533/jma.v1i1.6","url":null,"abstract":"The oxidation state and local structure of LiFeSi0.01P0.99O4/C composites as a cathode on lithium-ion battery were investigated by Fe K-edge X-ray Absorption Near Edge Spectroscopy (XANES) and Extended X-ray Absorption Fine Structure (EXAFS). The LiFeSi0.01P0.99O4/C sample was prepared by solid-state reaction process. Based on the XANES analysis, the absorption of edge energy (E0) of the sample was 7124.92 eV. In addition, linear combination fitting (LCF) analysis of XANES confirmed the oxidation state of iron mixture of 2+ and 3+ as the effect of silicon doped in LiFePO4. The Fourier Transform (FT) of the Fe K-edge EXAFS fitting analysis showed that the nearest neighbors surrounding atom Fe were the main peak with high intensity that confirmed Fe-O bond; the second and third peak with lower intensity confirmed Fe-P and Fe-Fe bonds, respectively. In addition, the SQUID magnetometer result of LiFeSi0.01P0.99O4/C indicated the antiferromagnetic order temperature of LiFeSi0.01P0.99O4/C at ~51 K with the indication of the presence of impurity and structural distortion.","PeriodicalId":360331,"journal":{"name":"Journal of Magnetism and Its Applications","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115568501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}