Journal
ADVANCED MATERIALS
Volume 32, Issue 48, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202004897
Keywords
epsilon iron oxide; magnetic recording; magnetization reversal; millimeter waves; nanoparticles
Categories
Funding
- Advanced Research Program for Energy and Environmental Technologies project by NEDO of METI [P14004]
- JSPS [15H05697, 20H00369]
- JSPS KAKENHI [16H06521, 18K03444, 20H02206]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) [JPMXP09F20UT0002]
- Elements Strategy Initiative Center for Magnetic Materials (ESICMM) - MEXT [12016013]
- [2903]
- [17H06367]
- Grants-in-Aid for Scientific Research [20H02206] Funding Source: KAKEN
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In the era of Big Data and the Internet of Things, data archiving is a key technology. From this viewpoint, magnetic recordings are drawing attention because they guarantee long-term data storage. To archive an enormous amount of data, further increase of the recording density is necessary. Herein a new magnetic recording methodology, focused-millimeter-wave-assisted magnetic recording (F-MIMR), is proposed. To test this methodology, magnetic films based on epsilon iron oxide nanoparticles are prepared and a focused-millimeter-wave generator is constructed using terahertz (THz) light. Irradiating the focused millimeter wave to epsilon iron oxide instantly switches its magnetic pole direction. The spin dynamics of F-MIMR are also calculated using the stochastic Landau-Lifshitz-Gilbert model considering all of the spins in an epsilon iron oxide nanoparticle. In F-MIMR, the heat-up effect of the recording media is expected to be suppressed. Thus, F-MIMR can be applied to high-density magnetic recordings.
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