Kabushiki Kaisha Toshiba

Toshiba Electronic Devices & Storage Corporation

Yousuke Isowaki

Masayuki Takagishi

Masatoshi Sakurai

Kenichiro Yamada

Yoshiyuki Kamata

Hitoshi Iwasaki

Kaori Kimura

Shuichi Murakami

Tomoyuki Maeda

Susumu Hashimoto

Naoki Hase

Katsuya Sugawara

Naoyuki Narita

Masaki Kado

Akira Watanabe

Satoshi Shirotori

Kazuaki Okamoto

Akira Kikitsu

Kosuke Tatsumura

Soichi Oikawa

Daisuke Saida

Michael Arnaud Quinsat

Yasushi Tomizawa

Hiroyuki Hieda

Kazuto Kashiwagi

Kohsuke Harada

According to one embodiment, a magnetic recording device includes a magnetic recording medium, a plurality of magnetic heads for recording information on the magnetic recording medium, and a controller for controlling the magnetic heads. Each of the magnetic heads includes a coil, a first magnetic pole for generating a magnetic field according to a recording current supplied to the coil, and a light emitting section for irradiating the magnetic recording medium with light to locally increase a temperature of the magnetic recording medium. The controller performs a first operation, in which a lifetime information related to a remaining life time of one of the magnetic heads is calculated based on a first information related to a failure probability of a magnetic head group including the magnetic heads and a second information related to a remaining time based on a history of the one of the magnetic heads.

Magnetic recording device and magnetic recording system

According to one embodiment, a magnetic reproducing processing device includes a decoder and an error correction decoder. A first signal based on a reproduced signal is input to the decoder. A signal based on a second signal output from the decoder is input to the error correction decoder. The error correction decoder is configured to correct errors in the second signal based on a check matrix. The decoder includes a neural network layer. The neural network layer includes a plurality of calculation nodes. A connection relationship between the plurality of calculation nodes is based on the check matrix.

Magnetic reproducing processing device, magnetic recording/reproducing device and magnetic reproducing method

According to one embodiment, a data processor includes an interface section and a processor. The interface section is configured to acquire partial data relating to a control condition of a magnetic recording/reproducing device. The processor is configured to process the partial data. The processor is configured to derive a first data by processing the partial data with a first model based on characteristics of the partial data, a first resolution of the first data being higher than a partial resolution of the partial data. The processor is configured to derive a second data by processing the partial data with a second model based on the characteristic. The second model is different from the first model. A second resolution of the second data being higher than the partial resolution.

Data processor, magnetic recording/reproducing device, and magnetic recording/reproducing system

According to one embodiment, a magnetic recording device includes a magnetic recording medium group and a magnetic head group. The magnetic recording medium group includes a first magnetic recording medium, a plurality of second magnetic recording media, and a plurality of third magnetic recording media. The magnetic head group includes a first magnetic head, a plurality of second magnetic heads, and a plurality of third magnetic heads. The first magnetic head is configured to record data on the first magnetic recording medium by a first method. One of the plurality of second magnetic heads is configured to record data on one of the plurality of second magnetic recording media by a second method different from the first method. One of the plurality of third magnetic heads is configured to record data on one of the plurality of third magnetic recording media by the second method.

Magnetic recording device, magnetic recording system, and control method for magnetic recording device

According to one embodiment, a magnetic reproduction processing device includes a decoder. The decoder includes a convolutional layer including a plurality of filters, and an attention layer configured to derive a degree of contribution related to the filters. The decoder is configured to output a decoded result obtained by integrating results of processing an input signal with the filters according to the degree of contribution.

Magnetic reproduction processing device, magnetic recording/reproducing device, and magnetic reproducing method

According to one embodiment, an operating condition determining device includes a memory, and a processer. The memory is configured to store a plurality of classifications relating to information corresponding to a vibration state of a magnetic recording/reproducing device, and a plurality of setting parameter sets relating to an operation of the magnetic recording/reproducing device. The setting parameter sets correspond to the classifications. The processer is configured to acquire a first data. The first data includes information of the vibration state of the magnetic recording/reproducing device. The information is measured. The processer is configured to acquire one of the setting parameter sets from the memory. The one of the setting parameter sets corresponds to one of the classifications corresponding to the first data.

Operating condition determining device, magnetic recording / reproducing device, and magnetic recording/reproducing system

According to one embodiment, a magnetic reproducing and processing device includes an acquirer and a processor. The acquirer is configured to acquire a first electric signal obtained by reproducing information recorded in a first recording area of a magnetic recording medium by a first reproducing element and a second electric signal obtained by reproducing the information recorded in the first recording area by a second reproducing element. A first sensitivity of the first reproducing element to a magnetic signal recorded on the magnetic recording medium is different from a second sensitivity of the second reproducing element to the magnetic signal. The processor is configured to output a reproduced signal corresponding to the information recorded in the first recording area based on the first electric signal and the second electric signal acquired by the acquirer.

Magnetic reproducing and processing device, magnetic recording and reproducing device, and magnetic reproducing method

A memory system has a nonvolatile memory having a plurality of readable and writable memory cells, a write voltage control unit that controls at least one of a voltage value and a pulse width of a write voltage of the nonvolatile memory in accordance with a weight of a signal processing path or a signal processing node, a write unit that writes data in two or more memory cell groups among the plurality of memory cells using the write voltage controlled by the write voltage control unit, a reversal probability detection unit that detects a reversal probability of the memory cell group when writing data is written by the write unit, and a weight conversion unit that converts the detected reversal probability into a weight.

Memory system, semiconductor storage device, and signal processing system

According to one embodiment, a magnetic recording and reproducing device includes an output driver, a magnetic head, and a magnetic recording medium. The output driver outputs a recording signal corresponding to input information. The magnetic head includes a coil. A recording current includes the recording signal flows in the coil. Information corresponding to the input information is recorded in the magnetic recording medium. The input information includes first, second, and third information combinations. The first information combination includes first to fourth information. The second information combination includes fifth to eighth information. The third information combination includes ninth to twelfth information. The recording signal changes to an eleventh recording current to correspond to the eleventh information. The recording signal changes to a third recording current to correspond to the third information. An absolute value of the eleventh recording current is greater than an absolute value of the third recording current.

Magnetic recording and reproducing device

A magnetic recording apparatus in an embodiment includes a magnetic head, a storage, a detector, and a controller. The magnetic head records data on a recording medium. The storage stores first current parameters defining a first current waveform, second current parameters defining a second current waveform, and recording bit sequence information. The detector detects a discontinuity point from the recording bit sequence information. The discontinuity point is defined by a position at which recording bit lengths are discontinuous. The controller controls a waveform of a recording current of the magnetic head, based on the first current parameters at a recording bit that is not next to the discontinuity point and based on the second current parameters at a recording bit that is next to the discontinuity point.

Magnetic recording apparatus and recording current control apparatus

According to one embodiment, a magnetic head includes first and second shields, a magnetic pole, and a trailing shield. The magnetic pole is provided between the first and second shields. The trailing shield is separated from the magnetic pole. The first shield includes first magnetic layers and first nonmagnetic layers arranged alternately along a first stacking direction. The first nonmagnetic layers include at least one selected from the group consisting of Ru, Cu, and Cr. Thicknesses of the first nonmagnetic layers each is not less than 0.3 nanometers and not more than 2.2 nanometers. The second shield includes second magnetic layers and second nonmagnetic layers arranged alternately along a second stacking direction. The second nonmagnetic layers include at least one selected from the group consisting of Ru, Cu, and Cr. Thicknesses of the second nonmagnetic layers each is not less than 0.3 nanometers and not more than 2.2 nanometers.

Magnetic recording and reproducing device comprising a magnetic head including a trailing shield and first and second shields having alternating magnetic and nonmagnetic layers

According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium and a magnetic head. The magnetic recording medium includes a first track including a first sub-track extending along a first direction, and a second sub-track extending along the first direction. The second sub-track is arranged with the first sub-track in a second direction intersecting the first direction. The magnetic head includes a recording unit and a reproducing unit. The recording unit records information in the magnetic recording medium. The reproducing unit reproduces the information recorded in the magnetic recording medium. The recording unit includes a magnetic pole, a write shield separated from the magnetic pole in the first direction, and a side shield separated from the magnetic pole in the second direction. The reproducing unit includes a reproducing element having a reproducing width along the second direction.

According to one embodiment, a magnetoresistance effect element includes first and second shields, first and second side magnetic units, a stacked body, and a hard bias unit. The first side magnetic unit includes a first soft magnetic layer, a first nonmagnetic intermediate layer, and a second soft magnetic layer. The second side magnetic unit includes a third soft magnetic layer, a second nonmagnetic intermediate layer, and a fourth soft magnetic layer. The stacked body includes a fifth ferromagnetic layer, a third nonmagnetic intermediate layer, and a sixth ferromagnetic layer. The hard bias unit is provided between the first and second shields. A first distance between the first and fifth magnetic layers is shorter than a second distance between the second and sixth magnetic layers. A third distance between the third and fifth magnetic layers is shorter than a fourth distance between the fourth and sixth magnetic layers.

Magnetoresistance effect element, magnetic head, magnetic head assembly, magnetic recording and reproducing device, and method for manufacturing magnetoresistance effect element

A magnetic head of an embodiment includes a stack, side shields, and a first and a second magnetic shield. The stack includes a pin layer having a fixed magnetization direction, a first free layer having a magnetization direction to change in accordance with an external magnetic field, a second free layer antiferromagnetically exchange-coupled with the first free layer and having a magnetization direction to change in accordance with the field, and an antiferromagnetic layer exchange-coupled with the second free layer. A magnetic field is applied from the side shields to the first and second free layers, and a direction of the magnetic field is substantially parallel to the magnetization direction of one of the first and second free layers and substantially antiparallel to the magnetization direction of the other, and a magnetic volume of the one is larger than a magnetic volume of the other.

Magnetic head and magnetic recording and reproducing apparatus

According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, a recording unit, and a reproducing unit. The magnetic recording medium includes a first track including first and second sub-tracks extending in a first direction. The second sub-track is arranged with the first sub-track in a second direction intersecting the first direction. The recording unit records information in the first and second sub-tracks. The reproducing unit reproduces the information recorded in the first and second sub-tracks while opposing the first, second sub-tracks, and a boundary between the first and second sub-tracks. The first sub-track includes first magnetic recording components including first and second components. The second sub-track includes second magnetic recording components including third and fourth components. A first recording symbol is formed of the first and third components. A second recording symbol is formed of the second and fourth components.

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Yokohama, Japan

Yousuke Isowaki