A performance study of next generation's TMR heads beyond 200 gb/in/sup 2/

Kagami, T.; Kuwashima, T.; Miura, S.; Uesugi, Takumi; Barada, K.; Ohta, N.; Kasahara, N.; Sato, Kazuki; Kanaya, Tomoaki; Kiyono, H.; Hachisuka, N.; Saruki, S.; Inage, K.; Takahashi, Norio; Terunuma, K.

doi:10.1109/tmag.2005.861796

Cited by 25 publications

(11 citation statements)

References 7 publications

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“…Therefore, MTJs are promising for applications in magnetic sensor industry. MTJ sensors can be applied in various areas such as biochips and biosensors [6][7][8], scanning MR microscopy [9], magnetocardiography and magnetoencephalography [10,11], harddisk drive (HDD) reading heads [12] and magnetoresistive random access memo� (MRAM) [13,14]. MTJ sensors with a detectivity of 2 pT/Hz I 2 at 500 kHz was experimentally achieved by Chave et al [15].…”

Section: Top Electrodementioning

confidence: 99%

A magnetically shielded instrument for magnetoresistance and noise characterizations of magnetic tunnel junction sensors

Lei

Peng

et al. 2010

2010 IEEE International Conference of Electron Devices and Solid-State Circuits (EDSSC)

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A magnetically shielded setup was developed for characterizing magneto resistance (MR) and noise properties of magnetic tunneling junction (MTJ) sensors. A mu-metal shielding is installed to avoid the interference of external magnetic disturbance. Both MR curves and noise power spectra of MTJ sensors can be obtained for further data analysis. Moreover, a hard-axis magnetic field can be applied to eliminate the hysteresis and the linear field response of MT J sensors can be measured. The preliminary measurement results on MTJ sensors are presented to illustrate the characterization capabilities of this setup.

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Section: Top Electrodementioning

confidence: 99%

A magnetically shielded instrument for magnetoresistance and noise characterizations of magnetic tunnel junction sensors

Lei

Peng

et al. 2010

2010 IEEE International Conference of Electron Devices and Solid-State Circuits (EDSSC)

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“…Polycrystalline MgO barrier shows significantly large MR ratio of over 50% with acceptable RA [5] and it was reported that MgO barrier is also workable to TMR heads as AlO x one [6]. MgO barrier has just been applied to next generation TMR heads over 120 Gb/in 2 and the film properties have been improving continuously to extend applicable recording density.…”

Section: Read Head Technologiesmentioning

confidence: 99%

Current status and future of magnetic heads for HDD

Terunuma¹

2007

Phys. Status Solidi (c)

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The rapid growth in consumer electronics application requires higher capacity data storage. For hard disk drive (HDD), many new technologies, such as media, heads, head‐disk interface (HDI), pre‐amp. and so on, have been introduced in order to increase the recording density. This paper focus on magnetic head technologies, such as materials, structures, fabrication process and head performance for HDD. For read heads, tunneling magnetoresistive (TMR) heads have come successively to replace giant magnetoresistive (GMR) heads. Barrier materials have been studied to obtain higher magnetoresisance (MR) ratio with lower resistance area product (RA). AlOx have been used as barrier for 100–120 Gb/in2 TMR heads. MgO barrier shows significantly large MR ratio and is also workable to TMR heads as AlOx one. For longitudinal magnetic recording (LMR) writer, recording performance has been improved with reducing yoke length and coil turns and changing to pole materials with higher saturation magnetization (Bs). Perpendicular magnetic recording (PMR) is introduced for over 120 Gb/in2. Combination between head and medium is much more important in PMR than LMR. The magnetic head is still one of the key component of HDD and is expected to be going to further promote the redording density and performance of HDD in the future. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…The first layer acts as a polarizer, while the second, with smaller coercivity, as an analyser. More advanced developments using tunnel magnetoresistance effects (TMR) made magnetic storage with enormously high density possible, which we use nowadays [68,69]. In TMR, the chromium layer is replaced by an insulating layer through which electrons can tunnel.…”

Section: What Is Spintronics? a Brief Historical Overviewmentioning

confidence: 99%

Combining Molecular Spintronics with Electron Paramagnetic Resonance: The Path Towards Single-Molecule Pulsed Spin Spectroscopy

Slota¹,

Bogani²

2020

Appl Magn Reson

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We provide a perspective on how single-molecule magnets can offer a platform to combine quantum transport and paramagnetic spectroscopy, so as to deliver time-resolved electron paramagnetic resonance at the single-molecule level. To this aim, we first review the main principles and recent developments of molecular spintronics, together with the possibilities and limitations offered by current approaches, where interactions between leads and single-molecule magnets are important. We then review progress on the electron quantum coherence on devices based on molecular magnets, and the pulse sequences and techniques necessary for their characterization, which might find implementation at the single-molecule level. Finally, we highlight how some of the concepts can also be implemented by including all elements into a single molecule and we propose an analogy between donor–acceptor triads, where a spin center is sandwiched between a donor and an acceptor, and quantum transport systems. We eventually discuss the possibility of probing spin coherence during or immediately after the passage of an electron transfer, based on examples of transient electron paramagnetic resonance spectroscopy on molecular materials.

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A performance study of next generation's TMR heads beyond 200 gb/in/sup 2/

Cited by 25 publications

References 7 publications

A magnetically shielded instrument for magnetoresistance and noise characterizations of magnetic tunnel junction sensors

A magnetically shielded instrument for magnetoresistance and noise characterizations of magnetic tunnel junction sensors

Current status and future of magnetic heads for HDD

Combining Molecular Spintronics with Electron Paramagnetic Resonance: The Path Towards Single-Molecule Pulsed Spin Spectroscopy

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