Observation of Zigzag-Shaped Magnetic Domain Boundaries in Granular Perpendicular Magnetic Recording Media Using Alternating Magnetic Force Microscopy
In granular media for perpendicular magnetic recording, zigzag-shaped magnetic domain boundaries form between magnetic grains isolated by a non-magnetic grain boundary phase. They are the main source of jitter noise caused by the position fluctuation of magnetic bit transitions. The imaging of zigza...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-12-01
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| Series: | Magnetochemistry |
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| Online Access: | https://www.mdpi.com/2312-7481/10/12/106 |
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| author | M. V. Makarova Hanamichi Tanaka Hiroshi Sonobe Toru Matsumura Hitoshi Saito |
| author_facet | M. V. Makarova Hanamichi Tanaka Hiroshi Sonobe Toru Matsumura Hitoshi Saito |
| author_sort | M. V. Makarova |
| collection | DOAJ |
| description | In granular media for perpendicular magnetic recording, zigzag-shaped magnetic domain boundaries form between magnetic grains isolated by a non-magnetic grain boundary phase. They are the main source of jitter noise caused by the position fluctuation of magnetic bit transitions. The imaging of zigzag boundaries thus becomes an important task to increase recording density with decreasing bit size, when the zigzag and bit sizes become comparable. We visualized the zigzag boundaries of magnetic domains in as-sputtered granular media with a spatial resolution of less than 3 nm using our developed Alternating Magnetic Force Microscopy (A-MFM). We used a soft magnetic amorphous FeCoB tip with high saturation magnetization, which further enhances the spatial resolution through the inverse magnetostrictive effect. The zigzag size ranged from 2 to 8 nm in media with an estimated grain size of around 5 nm. Additionally, we observed zigzag bit boundaries in commercially recorded granular media with a recording density of 500 kfci. |
| format | Article |
| id | doaj-art-aa38fdcf8a9a40aa89b9603cc0ca0f10 |
| institution | Kabale University |
| issn | 2312-7481 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Magnetochemistry |
| spelling | doaj-art-aa38fdcf8a9a40aa89b9603cc0ca0f102024-12-27T14:37:24ZengMDPI AGMagnetochemistry2312-74812024-12-01101210610.3390/magnetochemistry10120106Observation of Zigzag-Shaped Magnetic Domain Boundaries in Granular Perpendicular Magnetic Recording Media Using Alternating Magnetic Force MicroscopyM. V. Makarova0Hanamichi Tanaka1Hiroshi Sonobe2Toru Matsumura3Hitoshi Saito4Graduate School of Engineering Science, Akita University, 1-1 Tegata Gakuen-Machi, Akita 010-8502, JapanGraduate School of Engineering Science, Akita University, 1-1 Tegata Gakuen-Machi, Akita 010-8502, JapanGraduate School of Engineering Science, Akita University, 1-1 Tegata Gakuen-Machi, Akita 010-8502, JapanGraduate School of Engineering Science, Akita University, 1-1 Tegata Gakuen-Machi, Akita 010-8502, JapanGraduate School of Engineering Science, Akita University, 1-1 Tegata Gakuen-Machi, Akita 010-8502, JapanIn granular media for perpendicular magnetic recording, zigzag-shaped magnetic domain boundaries form between magnetic grains isolated by a non-magnetic grain boundary phase. They are the main source of jitter noise caused by the position fluctuation of magnetic bit transitions. The imaging of zigzag boundaries thus becomes an important task to increase recording density with decreasing bit size, when the zigzag and bit sizes become comparable. We visualized the zigzag boundaries of magnetic domains in as-sputtered granular media with a spatial resolution of less than 3 nm using our developed Alternating Magnetic Force Microscopy (A-MFM). We used a soft magnetic amorphous FeCoB tip with high saturation magnetization, which further enhances the spatial resolution through the inverse magnetostrictive effect. The zigzag size ranged from 2 to 8 nm in media with an estimated grain size of around 5 nm. Additionally, we observed zigzag bit boundaries in commercially recorded granular media with a recording density of 500 kfci.https://www.mdpi.com/2312-7481/10/12/106magnetic recordingzigzag boundariesmagnetic force microscopyamorphous soft magnetic films |
| spellingShingle | M. V. Makarova Hanamichi Tanaka Hiroshi Sonobe Toru Matsumura Hitoshi Saito Observation of Zigzag-Shaped Magnetic Domain Boundaries in Granular Perpendicular Magnetic Recording Media Using Alternating Magnetic Force Microscopy Magnetochemistry magnetic recording zigzag boundaries magnetic force microscopy amorphous soft magnetic films |
| title | Observation of Zigzag-Shaped Magnetic Domain Boundaries in Granular Perpendicular Magnetic Recording Media Using Alternating Magnetic Force Microscopy |
| title_full | Observation of Zigzag-Shaped Magnetic Domain Boundaries in Granular Perpendicular Magnetic Recording Media Using Alternating Magnetic Force Microscopy |
| title_fullStr | Observation of Zigzag-Shaped Magnetic Domain Boundaries in Granular Perpendicular Magnetic Recording Media Using Alternating Magnetic Force Microscopy |
| title_full_unstemmed | Observation of Zigzag-Shaped Magnetic Domain Boundaries in Granular Perpendicular Magnetic Recording Media Using Alternating Magnetic Force Microscopy |
| title_short | Observation of Zigzag-Shaped Magnetic Domain Boundaries in Granular Perpendicular Magnetic Recording Media Using Alternating Magnetic Force Microscopy |
| title_sort | observation of zigzag shaped magnetic domain boundaries in granular perpendicular magnetic recording media using alternating magnetic force microscopy |
| topic | magnetic recording zigzag boundaries magnetic force microscopy amorphous soft magnetic films |
| url | https://www.mdpi.com/2312-7481/10/12/106 |
| work_keys_str_mv | AT mvmakarova observationofzigzagshapedmagneticdomainboundariesingranularperpendicularmagneticrecordingmediausingalternatingmagneticforcemicroscopy AT hanamichitanaka observationofzigzagshapedmagneticdomainboundariesingranularperpendicularmagneticrecordingmediausingalternatingmagneticforcemicroscopy AT hiroshisonobe observationofzigzagshapedmagneticdomainboundariesingranularperpendicularmagneticrecordingmediausingalternatingmagneticforcemicroscopy AT torumatsumura observationofzigzagshapedmagneticdomainboundariesingranularperpendicularmagneticrecordingmediausingalternatingmagneticforcemicroscopy AT hitoshisaito observationofzigzagshapedmagneticdomainboundariesingranularperpendicularmagneticrecordingmediausingalternatingmagneticforcemicroscopy |