{"title":"用于热辅助磁记录的 3 层交换耦合复合介质","authors":"Yijia Liu;R. H. Victora","doi":"10.1109/TMAG.2024.3428417","DOIUrl":null,"url":null,"abstract":"A novel three-layer thermally exchange coupled composite (3ly-ECC) media is proposed to mitigate heat-assisted magnetic recording (HAMR)-related noise at reduced operating temperature, particularly transition noise. Leveraging the Zeeman effect and anisotropy field gradients to switch the writing layer and the middle layer, respectively, the proposed 3ly-ECCs effectively reduce transition jitter by ~15% and bit error rate (BER) by ~85% in the absence of intergranular exchange (IGE), compared with the 2ly-ECC with the same total thickness. The improvement in transition jitter is supported by an analytical analysis of the energy function using a simple spin model, which highlights the contribution of large anisotropy and small magnetization in the middle layer. However, it is noted that the 3ly-ECC is more susceptible to erasure-after-write (EAW) effect than 2ly-ECC. Calculations reveal that increasing the anisotropy of writing layer suppresses the EAW effect in 3ly-ECCs, yet adversely affects BER due to the loss of rapid switching. Overall, the proposed 3ly-ECC effectively balances fast switching and EAW to yield superior jitter and BER compared with the two-layer counterpart. The results suggest that future endeavors could focus on developing suitable high-Ku and low-Ms composite media to potentially improve the areal density (AD) of HAMR device.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":null,"pages":null},"PeriodicalIF":2.1000,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Three-Layer Exchange Coupled Composite Media for Heat-Assisted Magnetic Recording\",\"authors\":\"Yijia Liu;R. H. Victora\",\"doi\":\"10.1109/TMAG.2024.3428417\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A novel three-layer thermally exchange coupled composite (3ly-ECC) media is proposed to mitigate heat-assisted magnetic recording (HAMR)-related noise at reduced operating temperature, particularly transition noise. Leveraging the Zeeman effect and anisotropy field gradients to switch the writing layer and the middle layer, respectively, the proposed 3ly-ECCs effectively reduce transition jitter by ~15% and bit error rate (BER) by ~85% in the absence of intergranular exchange (IGE), compared with the 2ly-ECC with the same total thickness. The improvement in transition jitter is supported by an analytical analysis of the energy function using a simple spin model, which highlights the contribution of large anisotropy and small magnetization in the middle layer. However, it is noted that the 3ly-ECC is more susceptible to erasure-after-write (EAW) effect than 2ly-ECC. Calculations reveal that increasing the anisotropy of writing layer suppresses the EAW effect in 3ly-ECCs, yet adversely affects BER due to the loss of rapid switching. Overall, the proposed 3ly-ECC effectively balances fast switching and EAW to yield superior jitter and BER compared with the two-layer counterpart. The results suggest that future endeavors could focus on developing suitable high-Ku and low-Ms composite media to potentially improve the areal density (AD) of HAMR device.\",\"PeriodicalId\":13405,\"journal\":{\"name\":\"IEEE Transactions on Magnetics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.1000,\"publicationDate\":\"2024-07-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IEEE Transactions on Magnetics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://ieeexplore.ieee.org/document/10606106/\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, ELECTRICAL & ELECTRONIC\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Magnetics","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/10606106/","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
Three-Layer Exchange Coupled Composite Media for Heat-Assisted Magnetic Recording
A novel three-layer thermally exchange coupled composite (3ly-ECC) media is proposed to mitigate heat-assisted magnetic recording (HAMR)-related noise at reduced operating temperature, particularly transition noise. Leveraging the Zeeman effect and anisotropy field gradients to switch the writing layer and the middle layer, respectively, the proposed 3ly-ECCs effectively reduce transition jitter by ~15% and bit error rate (BER) by ~85% in the absence of intergranular exchange (IGE), compared with the 2ly-ECC with the same total thickness. The improvement in transition jitter is supported by an analytical analysis of the energy function using a simple spin model, which highlights the contribution of large anisotropy and small magnetization in the middle layer. However, it is noted that the 3ly-ECC is more susceptible to erasure-after-write (EAW) effect than 2ly-ECC. Calculations reveal that increasing the anisotropy of writing layer suppresses the EAW effect in 3ly-ECCs, yet adversely affects BER due to the loss of rapid switching. Overall, the proposed 3ly-ECC effectively balances fast switching and EAW to yield superior jitter and BER compared with the two-layer counterpart. The results suggest that future endeavors could focus on developing suitable high-Ku and low-Ms composite media to potentially improve the areal density (AD) of HAMR device.
期刊介绍:
Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The IEEE Transactions on Magnetics publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.