TMR tape drive for a 15 TB cartridge

Biskeborn, R. G.; Fontana, R.E.; Lo, C.; Czarnecki, W; Liang, J.; Iben, Icko; Decad, G. M.; Hipolito, Venus A.

doi:10.1063/1.5007788

AIP Advances

2017

DOI: 10.1063/1.5007788

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TMR tape drive for a 15 TB cartridge

R. G. Biskeborn

R.E. Fontana

C. Lo

et al.

Abstract: This paper highlights the development of tunnel magnetoresistive (TMR) sensors for magnetic tape recording applications. This has led to the introduction of a tape drives supporting a 15 TB native tape cartridge, currently the highest capacity available. Underscoring this development is the fact that the TMR sensors must run in continual contact with the tape media. This is contrasted with modern hard disk drive (hdd) sensors, which fly above the disk platters. Various challenges encountered in developing and … Show more

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Cited by 7 publications

(1 citation statement)

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“…are common tools used for storing data. However, tape drive systems have been proven to be more effective for disaster recovery and stable depository (Biskeborn et al, 2018;Angeliki Pantazi and Lantz, 2014). As the amount of data created, replicated and archived are significantly increasing globally (Pantazi et al, 2012), the demand for economical and durable storage solutions is expeditiously growing.…”

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confidence: 99%

Modeling and Velocity Tracking Control for Tape Drive System

Okubanjo¹,

Oyetola²,

Osifeko³

et al. 2018

Journal of Applied Sciences and Environmental Management

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The objectives of this paper are to formulate mathematical model for the tape drive system (TDS) by designing velocity tracking controller using physical laws. A Matlab function script and Simulink model were developed in Matlab and Simulink environment. The result of the study revealed that 7.07, 8 and 10 of koln values met the design goal and also resulted in optimal control performance with the following characteristics 7.31%,7.71% , 9.41% overshoot,1.07,1.08, 1.09 sec peak time , 0.385,0.346,0.281sec settling time,149,168 and 210 proportional gain, and 67.2,65.6, 62.3 phase margin respectively. While the responses at other values of koln resulted in an unsatisfactory performance. Based on simulation results and observations, it is evident that prediction of the performance of the controller depends on numerical value of koln .More so, larger values of koln lead to substantial increase in velocity variation resulting into worst prediction of the controller parameters.

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mentioning

confidence: 99%

Modeling and Velocity Tracking Control for Tape Drive System

Okubanjo¹,

Oyetola²,

Osifeko³

et al. 2018

Journal of Applied Sciences and Environmental Management

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Magnetic and Electronic Properties of Complex Oxides from First‐Principles

Hoffmann

Ernst

Hergert

et al. 2020

Physica Status Solidi (b)

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The theoretical treatment of complex oxide structures requires a combination of efficient methods to calculate structural, electronic, and magnetic properties, due to special challenges such as strong correlations and disorder. In terms of a multicode approach, this study combines various complementary first‐principles methods based on density functional theory to exploit their specific strengths. Pseudopotential methods, known for giving reliable forces and total energies, are used for structural optimization. The optimized structure serves as input for the Green's function and linear muffin‐tin orbital methods. Those methods are powerful for the calculation of magnetic ground states and spectroscopic properties. Within the multicode approach, disorder is investigated by means of the coherent potential approximation within a Green's function method or by construction of special quasirandom structures in the framework of the pseudopotential methods. Magnetic ground states and phase transitions are studied using an effective Heisenberg model treated in terms of a Monte Carlo method, where the magnetic exchange parameters are calculated from first‐principles. The performance of the multicode approach is demonstrated with different examples, including defect formation, strained films, and surface properties.

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Laser induced crystallization of Co–Fe–B films

Almeida

Sharma

Matthes

et al. 2021

Sci Rep

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Local crystallization of ferromagnetic layers is crucial in the successful realization of miniaturized tunneling magnetoresistance (TMR) devices. In the case of Co–Fe–B TMR devices, used most successfully so far in applications and devices, Co–Fe–B layers are initially deposited in an amorphous state and annealed post-deposition to induce crystallization in Co–Fe, thereby increasing the device performance. In this work, first direct proof of locally triggered crystallization of 10 nm thick Co–Fe–B films by laser irradiation is provided by means of X-ray diffraction (XRD) using synchrotron radiation. A comparison with furnace annealing is performed for benchmarking purposes, covering different annealing parameters, including temperature and duration in the case of furnace annealing, as well as laser intensity and scanning speed for the laser annealing. Films of Co–Fe–B with different stoichiometry sandwiched between a Ru and a Ta or MgO layer were systematically assessed by XRD and SQUID magnetometry in order to elucidate the crystallization mechanisms. The transformation of Co–Fe–B films from amorphous to crystalline is revealed by the presence of pronounced CoFe(110) and/or CoFe(200) reflexes in the XRD θ-2θ scans, depending on the capping layer. For a certain window of parameters, comparable crystallization yields are obtained with furnace and laser annealing. Samples with an MgO capping layer required a slightly lower laser intensity to achieve equivalent Co–Fe crystallization yields, highlighting the potential of laser annealing to locally enhance the TMR ratio.

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TMR tape drive for a 15 TB cartridge

Cited by 7 publications

References 4 publications

Modeling and Velocity Tracking Control for Tape Drive System

Modeling and Velocity Tracking Control for Tape Drive System

Magnetic and Electronic Properties of Complex Oxides from First‐Principles

Laser induced crystallization of Co–Fe–B films

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