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- Masato Shiimoto, Hiroyuki Katada, +5 authors Kazuhiro Nakamoto
- IEEE Transactions on Magnetics
- 2010

We investigated the effect of track edge noise on transition curvature and track edge fluctuation through experiments and calculations. We measured and calculated two types of recording heads thatâ€¦ (More)

- Lei Xu, Terry L Olson, Byron H. Lengsfield, Masato Shiimoto, Mikito Sugiyama, Adam F. Torabi
- IEEE Transactions on Magnetics
- 2015

We present a micromagnetic modeling study of microwave assisted magnetic recording (MAMR) on a typical exchange-coupled four-layer media. With the help of an alternating current (ac) magnetic field,â€¦ (More)

- Masato Shiimoto, Hitoshi Katada, Keitaro Nakamoto, Hidetoshi Hoshiya, S. Das
- IEEE Transactions on Magnetics
- 2008

We investigated the effect of current-confined path on spin-torque noise in current perpendicular to the plane giant magnetoresistive (CPP-GMR) heads with a current screen layer (a nano-oxide layerâ€¦ (More)

- Ikuya Tagawa, Masato Shiimoto, Masato Matsubara, Shuya Nosaki, Yosuke Urakami, Jun Aoyama
- IEEE Transactions on Magnetics
- 2016

Microwave-assisted magnetic recording (MAMR) is one of the promising candidate technologies for next-generation hard disk drives. In MAMR, the high-frequency field from a spin-torque oscillator (STO)â€¦ (More)

- Terry L Olson, Byron H. Lengsfield, G. J. Parker, Masato Shiimoto, Mikito Sugiyama, Lei Xu
- IEEE Transactions on Magnetics
- 2016

We present micromagnetic simulations at various grain sizes of four-layer exchange-coupled composite microwave-assisted magnetic recording (MAMR) systems that have maximized areal density capabilityâ€¦ (More)

- Masato Shiimoto, Masukazu Igarashi, Mikito Sugiyama, Yasutaka Nishida, Ikuya Tagawa
- IEEE Transactions on Magnetics
- 2013

We investigated the effect of effective field distribution on the recording performance in microwave-assisted magnetic recording (MAMR) through calculations. We calculated the effective fieldâ€¦ (More)

- Hitoshi Katada, M. Hashimoto, +7 authors Keitaro Nakamoto
- IEEE Transactions on Magnetics
- 2010

We investigated medium noise using spinstand testing and calculation from the view point of head/media integration for 1 Tb/in <sup>2</sup>, focusing on two kinds of noise sources: transition noiseâ€¦ (More)

- Yuji Urakami, N. Ito, +5 authors Keitaro Nakamoto
- IEEE Transactions on Magnetics
- 2009

Track-edge noise, which is one of the major hindrances in achieving the narrow track recording, was studied through spinstand testing and micromagnetics simulations. Three heads with different writeâ€¦ (More)

- Terry L Olson, Masukazu Igarashi, Byron H. Lengsfield, Masato Shiimoto, Mikito Sugiyama, Roger Wood
- IEEE Transactions on Magnetics
- 2015

Microwave-assisted magnetic recording (MAMR) employs a spin-torque oscillator (STO) to assist a standard magnetic writer field in switching grains of a magnetic recording medium. The STO field hasâ€¦ (More)

- Keitaro Nakamoto, Hidetoshi Hoshiya, +10 authors James F. Childress
- IEEE Transactions on Magnetics
- 2008

Current-perpendicular-to-plane (CPP) giant magnetoresistive (GMR) heads with a current screen layer were fabricated, and the recording performance was measured. An output voltage of 1.9 mV andâ€¦ (More)

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