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| Presentation | 2009-07-16 14:40 Thermal Stability of Data Storage Tapes Prepared from Ultrafine Particles Hiroaki Nishio, Hiroshi Yamamoto (Meiji Univ.)  MR2009-16 Link to ES Tech. Rep. Archives: MR2009-16 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | The reverse field dependence of the normalized magnetization decay and the effect of the ratio of the fluctuation field (Hf) to coercivity (Hc) on the temperature coefficient of coercivity {α(Hc)} were studied for advanced data storage tapes prepared from ultrafine acicular metal particulate (MP) composite and hexagonal platelet Ba-ferrite (BF) particles. The mean volume of particles (Vphy) for these tapes varied from approximately 2000-5000 nm3. The effects of the degree of particle orientation (OR) on the normalized magnetization decay and activation volume (Vact) were also studied for advanced MP tapes. The values of Hf were not constant, but were largely dependent on the reverse field for ultrafine MP and all of BF tapes. In comparison to MP and BF tapes with approximately same Vphy, the normalized magnetization decay and Hf of BF tapes were much larger than that of MP tapes. The smaller the Vphy was, the larger the normalized magnetization decay became. The value of α(Hc), which is important for the thermal stability of high-density recording media, increased as the ratio Hf/Hc increased for both tapes. In MP tape with a larger Vphy (5300 nm3), increasing the OR was found to decrease the normalized magnetization decay. However, OR values had little effect on the normalized magnetization decay of advanced MP tape with a smaller Vphy (1700 nm3) and it was difficult to decrease the irreversible susceptibility that is affected significantly the normalized magnetization decay. These may be attributed to the existence of a few particles approaching the theoretical superparamagnetic limit. The value of Vact in the low reverse field, which is a major factor affecting media noise, decreased as OR increased regardless of Vphy. To decrease the normalized magnetization decay, it is particularly important to originate in decreasing Hf and increase Hc that related to the anisotropy field and distribution for advanced MP and BF tapes with very small Vphy. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Activation Volume / Ba-ferrite Particle / Data Storage Tape / Fluctuation Field / Metal Particle / Thermal Stability / / | |
| Reference Info. | IEICE Tech. Rep., vol. 109, July 2009. | |
| Paper # | ||
| Date of Issue | 2009-07-09 (MR) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | MR2009-16 Link to ES Tech. Rep. Archives: MR2009-16 |
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| Conference Information | |
| Committee | MRIS ITE-MMS |
| Conference Date | 2009-07-16 - 2009-07-16 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tokyo Inst. of Tech. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | MRIS |
| Conference Code | 2009-07-MR-MMS |
| Language | English (Japanese title is available) |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Thermal Stability of Data Storage Tapes Prepared from Ultrafine Particles |
| Sub Title (in English) | |
| Keyword(1) | Activation Volume |
| Keyword(2) | Ba-ferrite Particle |
| Keyword(3) | Data Storage Tape |
| Keyword(4) | Fluctuation Field |
| Keyword(5) | Metal Particle |
| Keyword(6) | Thermal Stability |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Hiroaki Nishio |
| 1st Author's Affiliation | Meiji University (Meiji Univ.) |
| 2nd Author's Name | Hiroshi Yamamoto |
| 2nd Author's Affiliation | Meiji University (Meiji Univ.) |
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| Speaker | Author-1 |
| Date Time | 2009-07-16 14:40:00 |
| Presentation Time | 25 minutes |
| Registration for | MRIS |
| Paper # | MR2009-16 |
| Volume (vol) | vol.109 |
| Number (no) | no.132 |
| Page | pp.19-24 |
| #Pages | 6 |
| Date of Issue | 2009-07-09 (MR) |
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