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Paper Abstract and Keywords
Presentation 2015-06-04 14:15
Dual free-layer spin-torque oscillator for read head application in magnetic recording
Tazumi Nagasawa, Kiwamu Kudo, Hirofumi Suto, Michinaga Yamagishi, Koichi Mizushima, Rie Sato (Toshiba RDC)
Abstract (in Japanese) (See Japanese page) 
(in English) Read heads for HDDs with areal density over 2 Tb/in2 are predicted to suffer from magnetic noises that seriously reduce the signal-to-noise (S/N) ratio. To overcome this problem, a novel read head composed of a spin-torque oscillator (STO) has recently been proposed. For the implementation of an STO read head, large-amplitude microwave emissions with narrow spectral linewidth are required. In this article, we experimentally study the oscillation properties of an STO with a dual free layer and its response to a pulsed magnetic field. This type of STO shows large-amplitude oscillations with narrow linewidth because of synchronized magnetization motions in the two free layers. In addition, this STO has a thinner structure than the conventional one. This feature is preferable for an STO read head, in which the STO needs to be placed inside a narrow shield-to-shield gap to obtain high spatial resolution.
Keyword (in Japanese) (See Japanese page) 
(in English) Spin-Torque Oscillator / STO / Magnetic Recording / Read Head / Dual Free Layer / / /  
Reference Info. ITE Tech. Rep.
Paper #  
Date of Issue  
ISSN Print edition: ISSN 1342-6893  Online edition: ISSN 2424-1970
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Conference Information
Committee IEICE-MRIS MMS  
Conference Date 2015-06-04 - 2015-06-05 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Recording Systems, etc. 
Paper Information
Registration To IEICE-MRIS 
Conference Code 2015-06-MR-MMS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Dual free-layer spin-torque oscillator for read head application in magnetic recording 
Sub Title (in English)  
Keyword(1) Spin-Torque Oscillator  
Keyword(2) STO  
Keyword(3) Magnetic Recording  
Keyword(4) Read Head  
Keyword(5) Dual Free Layer  
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1st Author's Name Tazumi Nagasawa  
1st Author's Affiliation Toshiba R&D Center (Toshiba RDC)
2nd Author's Name Kiwamu Kudo  
2nd Author's Affiliation Toshiba R&D Center (Toshiba RDC)
3rd Author's Name Hirofumi Suto  
3rd Author's Affiliation Toshiba R&D Center (Toshiba RDC)
4th Author's Name Michinaga Yamagishi  
4th Author's Affiliation Toshiba R&D Center (Toshiba RDC)
5th Author's Name Koichi Mizushima  
5th Author's Affiliation Toshiba R&D Center (Toshiba RDC)
6th Author's Name Rie Sato  
6th Author's Affiliation Toshiba R&D Center (Toshiba RDC)
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Speaker
Date Time 2015-06-04 14:15:00 
Presentation Time 25 
Registration for IEICE-MRIS 
Paper #  
Volume (vol) ITE-39 
Number (no)  
Page  
#Pages ITE- 
Date of Issue  


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