Novrita Idayanti, De di, Dadang Mulyadi, Tony Kristiantoro, Nanang Sudrajat, Gandi Sugandi, Azwar Manaf
{"title":"不同成分比例对SrFe<SUB>12</SUB> 0 <SUB>19</SUB>/CoFe<SUB>2</SUB> 0 <SUB>4</SUB>纳米复合磁体","authors":"Novrita Idayanti, De di, Dadang Mulyadi, Tony Kristiantoro, Nanang Sudrajat, Gandi Sugandi, Azwar Manaf","doi":"10.4283/jmag.2023.28.3.251","DOIUrl":null,"url":null,"abstract":"This study aims to examine the effect of various composition ratios on the exchange spring effect of strontium ferrite (SrFeSUB12/SUBOSUB19/SUB)/cobalt ferrite (CoFe2O4) nanocomposite magnets. Nanoparticles of hexagonal hard phase SrFeSUB12/SUBOSUB19/SUB and spinel soft phase CoFeSUB2/SUBOSUB4/SUB were each prepared through mechanical alloying and high-power ultrasonic irradiation processes. Furthermore, the constituent of the hard-soft particles was weighed based on its ratios and the mixture was homogenized under a sonicator-type Qsonica at a frequency of 20 kHz for an hour. The bulk composite samples were obtained in cylindrical pellets form through compaction of mixture powders at 5000 kg/cm2, followed by sintering at 1200 °C. The exchange spring effect enhanced the magnetic properties, surpassing the normal limit for non-interacting magnetic particles due to enhanced grain interactions. The results showed that the degree of property enhancement depended on the various composition ratios and microstructure of the composite magnets. The magnetization of saturation (MSUBs/SUB) of the samples increased compared to a single SrFeSUB12/SUBOSUB19/SUB. Furthermore, the highest coercivity (HSUBc/SUB) and product energy maximum (BH)SUBmax/SUB values were observed in the sample which had mass ratios of SHF:COF of 85:15 with coded S80C20. The occurrence of exchange spring effects was observed in material characterized by a microstructure consisting of a hard-magnetic phase with elevated magnetocrystalline anisotropy and saturation magnetization values, along with a soft magnetic phase exhibiting high saturation magnetization value.","PeriodicalId":16147,"journal":{"name":"Journal of Magnetics","volume":null,"pages":null},"PeriodicalIF":0.6000,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of Various Composition Ratios on the Exchange Spring Effect in SrFe<SUB>12</SUB>O<SUB>19</SUB>/CoFe<SUB>2</SUB>O<SUB>4</SUB> Nanocomposite Magnets\",\"authors\":\"Novrita Idayanti, De di, Dadang Mulyadi, Tony Kristiantoro, Nanang Sudrajat, Gandi Sugandi, Azwar Manaf\",\"doi\":\"10.4283/jmag.2023.28.3.251\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"This study aims to examine the effect of various composition ratios on the exchange spring effect of strontium ferrite (SrFeSUB12/SUBOSUB19/SUB)/cobalt ferrite (CoFe2O4) nanocomposite magnets. Nanoparticles of hexagonal hard phase SrFeSUB12/SUBOSUB19/SUB and spinel soft phase CoFeSUB2/SUBOSUB4/SUB were each prepared through mechanical alloying and high-power ultrasonic irradiation processes. Furthermore, the constituent of the hard-soft particles was weighed based on its ratios and the mixture was homogenized under a sonicator-type Qsonica at a frequency of 20 kHz for an hour. The bulk composite samples were obtained in cylindrical pellets form through compaction of mixture powders at 5000 kg/cm2, followed by sintering at 1200 °C. The exchange spring effect enhanced the magnetic properties, surpassing the normal limit for non-interacting magnetic particles due to enhanced grain interactions. The results showed that the degree of property enhancement depended on the various composition ratios and microstructure of the composite magnets. The magnetization of saturation (MSUBs/SUB) of the samples increased compared to a single SrFeSUB12/SUBOSUB19/SUB. Furthermore, the highest coercivity (HSUBc/SUB) and product energy maximum (BH)SUBmax/SUB values were observed in the sample which had mass ratios of SHF:COF of 85:15 with coded S80C20. The occurrence of exchange spring effects was observed in material characterized by a microstructure consisting of a hard-magnetic phase with elevated magnetocrystalline anisotropy and saturation magnetization values, along with a soft magnetic phase exhibiting high saturation magnetization value.\",\"PeriodicalId\":16147,\"journal\":{\"name\":\"Journal of Magnetics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.6000,\"publicationDate\":\"2023-09-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Magnetics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.4283/jmag.2023.28.3.251\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Magnetics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.4283/jmag.2023.28.3.251","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Effect of Various Composition Ratios on the Exchange Spring Effect in SrFe<SUB>12</SUB>O<SUB>19</SUB>/CoFe<SUB>2</SUB>O<SUB>4</SUB> Nanocomposite Magnets
This study aims to examine the effect of various composition ratios on the exchange spring effect of strontium ferrite (SrFeSUB12/SUBOSUB19/SUB)/cobalt ferrite (CoFe2O4) nanocomposite magnets. Nanoparticles of hexagonal hard phase SrFeSUB12/SUBOSUB19/SUB and spinel soft phase CoFeSUB2/SUBOSUB4/SUB were each prepared through mechanical alloying and high-power ultrasonic irradiation processes. Furthermore, the constituent of the hard-soft particles was weighed based on its ratios and the mixture was homogenized under a sonicator-type Qsonica at a frequency of 20 kHz for an hour. The bulk composite samples were obtained in cylindrical pellets form through compaction of mixture powders at 5000 kg/cm2, followed by sintering at 1200 °C. The exchange spring effect enhanced the magnetic properties, surpassing the normal limit for non-interacting magnetic particles due to enhanced grain interactions. The results showed that the degree of property enhancement depended on the various composition ratios and microstructure of the composite magnets. The magnetization of saturation (MSUBs/SUB) of the samples increased compared to a single SrFeSUB12/SUBOSUB19/SUB. Furthermore, the highest coercivity (HSUBc/SUB) and product energy maximum (BH)SUBmax/SUB values were observed in the sample which had mass ratios of SHF:COF of 85:15 with coded S80C20. The occurrence of exchange spring effects was observed in material characterized by a microstructure consisting of a hard-magnetic phase with elevated magnetocrystalline anisotropy and saturation magnetization values, along with a soft magnetic phase exhibiting high saturation magnetization value.
期刊介绍:
The JOURNAL OF MAGNETICS provides a forum for the discussion of original papers covering the magnetic theory, magnetic materials and their properties, magnetic recording materials and technology, spin electronics, and measurements and applications. The journal covers research papers, review letters, and notes.