日立達到nanotechnology里程碑為變成四倍太字節硬盤
東京， 10月。 15, 2007 — Hitachi, Ltd. (NYSE ： 命中/TSE ： 6501) 并且日立全球性儲存工藝(日立GST)，今天宣佈他們開發了世界的最小的讀頭技術為硬盤驅動器，在筆記本硬盤預計變成四倍當前存儲容量極限對四個太字節(TB)在桌面硬盤和一TB。
研究員在日立由更多在30-50毫微米(nm)範圍比因素成功地減少現有的錄音磁頭二達到新的頭，平均人髮的寬度2,000次小於(大約。 70-100微米)。 叫的當前垂直對這飛機巨型magneto-resistive*1 (CPP-GMR)頭， 2009年2011年日立的新技術在運輸產品預計被實施并且實現它的潛能。
日立在日本將提出這些成就在第8個垂直磁帶錄製會議(PMRC 2007)，被拿著第15 2007年10月17日，在東京國際論壇。
「日立在深刻的研究繼續投資為硬盤驅動器的推進，我們相信沒有其他技術能提供硬盤的高容量，便宜的價值為可預見的將來」，有限公司說Hiroaki小田原，研究中心，中央研究實驗室，日立，研究室主任，儲存工藝。 「這是一個成就為消費者，和它為日立一樣多。 它允許日立促進存貯â ˜Terabyte Era†™的€成長，我們開始，并且給消費者實際上不可限量的能力為存放他們的數量」。
日立相信CPP-GMR頭將使能硬盤驅動器(HDD)記錄密度每平方英寸(Gb/in2) 500吉比特對每平方英寸(Tb/in2)一terabit，變成四倍今天最高的面密度。 今年初，而最高的面密度日立GST產品今天運輸在200 Gb/in2範圍，日立GST提供了產業的第一個太字節硬盤與148 Gb/in2。 這些產品使用現有的頂頭技術，稱TMR*2 (隧道磁電機抗拒)頭。 錄音磁頭和媒介是控制小型化演變和硬盤驅動器的指數容量成長的二種關鍵技術。
切開通過噪聲-最強的信號噪音比
硬盤驅動器的持續的推進要求能力越來越緊壓和因而，越来越小數據位元錄音媒介，需要錄音磁頭的持續的小型化讀那些位。 然而，頭變得更小，電阻增量，也反過來增加輸出的噪聲并且減弱頭的能力正確地讀數據信號。
High signal output and low noise is what is desired in hard drive read operations, thus, researchers try to achieve a high signal-to-noise (S/N) ratio in developing effective read-head technology. Using TMR head technology, researchers predict that accurate read operations would not be conducted with confidence as recording densities begin to surpass 500 Gb/in2.The CPP-GMR device, compared to the TMR device, exhibits less of an electrical resistance, resulting in lower electrical noise but also a smaller output signal. Therefore, issues such as producing a high output signal while maintaining a reduced noise to increase the S/N ratio needed to be resolved before the CPP-GMR technology became practical
In response to this challenge, Hitachi, Ltd. and Hitachi GST have co-developed high-output technology and noise-reduction technology for the CPP-GMR head. A high electron-spin-scattering magnetic film material was used in the CPP-GMR layer to increase the signal output from the head, and new technology for damage-free fine patterning and noise suppression were developed. As a result, the signal-to-noise ratio, an important factor in determining the performance of a head, was drastically improved. For heads with track widths of 30nm to 50nm, optimal and industry-leading S/N ratios of 30 decibel (dB) and 40 dB, respectively, were recently achieved with the heads co-developed at Hitachi GST’s San Jose Research Center and Hitachi, Ltd.’s Central Research Laboratory in Japan.
Recording heads with 50 nm track-widths are expected to debut in commercial products in 2009, while those with 30 nm track-widths will be implemented in products in 2011. Current TMR heads, shipping in products today, have track-widths of 70 nm.
The Incredible Shrinking Head
The discovery of the GMR effect occurred in 1988, and that body of work was recognized just last week with a Nobel Prize for physics. Nearly two decades after its discovery, the effects of GMR technology are felt more strongly than ever with Hitachi’s demonstration of the CPP-GMR head today.
In 1997, nine years after the initial discovery of GMR technology, IBM implemented the industry’s first GMR heads in the Deskstar 16GXP. GMR heads allowed the HDD industry to continue its capacity growth and enabled the fastest growth period in history, when capacity doubled every year in the early 2000s. Today, although areal density growth has slowed, advancements to recording head technology, along with other HDD innovations, are enabling HDD capacity to double every two years.
In the past 51 years of the HDD industry, recording head technology has seen monumental decreases in size as areal density and storage capacity achieved dizzying heights. The first HDD recording head, called the inductive head, debuted in 1956 in the RAMAC - the very first hard drive - with a track width of 1/20th of an inch or 1.2 million nm. Today, the CPP-GMR head, with a track-width of about one-millionth of an inch or 30 nm, represents a size reduction by a factor of 40,000 over the inductive head used in the RAMAC in 1956.
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