Nec Corporation

Riken Corporation

Junichi Iwasaki

Masashi Kawasaki

Yoshinori Tokura

Yoshio Kaneko

Naoto Nagaosa

Wataru Koshibae

Toshiya Takahashi

Shingo Kojima

Hisao Harigai

Akira Kuwata

A magnetic element capable of generating and erasing a skyrmion, including a magnet shaped as a thin layer and including a structure surrounded by a nonmagnetic material; a current path provided surrounding an end region including an end portion of the magnet, on one surface of the magnet; and a skyrmion sensor that detects the generation and erasing of the skyrmion. With Wm being width of the magnet and hm being height of the magnet, a size of the magnet, with the skyrmion of a diameter &#x3bb; being generated, is such that 2&#x3bb;&#x3e;Wm&#x3e;&#x3bb;/2 and 2&#x3bb;&#x3e;hm&#x3e;&#x3bb;/2. With W being width of the end region in a direction parallel to the end portion of the magnet and h being height of the end region in a direction perpendicular to the end portion of the magnet, the end region is such that &#x3bb;&#x2265;W&#x3e;&#x3bb;/4 and 2&#x3bb;&#x3e;h&#x3e;&#x3bb;/2.

Magnetic element, skyrmion memory, skyrmion memory-device, solid-state electronic device, data-storage device, data processing and communication device

Provided is a magnetic element capable of generating one skyrmion and erasing the one skyrmion. The magnetic element includes a magnet shaped like a substantially rectangular flat plate, an upstream electrode connected to the magnet in a width Wm direction of the magnet and made of a non-magnetic metal, a downstream electrode connected to the magnet in the width Wm direction to oppose the upstream electrode and made of a non-magnetic metal, and a skyrmion sensor configured to detect the skyrmion. Here, a width Wm of the substantially rectangular magnet is such that 3&#xb7;&#x3bb;&#x3e;Wm&#x2265;&#x3bb;, where &#x3bb; denotes a diameter of the skyrmion, a length Hm of the substantially rectangular magnet is such that 2&#xb7;&#x3bb;&#x3e;Hm&#x2265;&#x3bb;, and the magnet has a notch structure at the edge between the upstream electrode and the downstream electrode.

Magnetic element, skyrmion memory, skyrmion memory device, skyrmion-memory embedded solid-state electronic device, data storage apparatus, data processing and communication apparatus

To provide a magnetic element capable of performing skyrmion transfer, a skyrmion memory to which this magnetic element is applied, and a shift register, for example, a magnetic element capable of performing skyrmion transfer is provided, the magnetic element providing a transverse transfer arrangement in which the skyrmion is transferred substantially perpendicular to a current between an upstream electrode and a downstream electrode, and including a plurality of stable positions in which the skyrmion exists more stably than in other regions of a magnet, and a skyrmion sensor that detects a position of the skyrmion.

A magnetic storage media which has an endurance (durability) characteristics close to an infinite number of writing times of data and a data retention (holding) characteristics close to permanency, and is ultra-high-speed writable and erasable, and a data storage device and an image storage device which apply this magnetic storage media are provided. A magnetic storage media includes a thin layer magnet and a magnetic field generating unit arranged facing a surface of the magnet, and is capable of creating or eliminating a skyrmion by applying heat energy to another surface of the magnet positioned on the opposite side of the surface of the magnet, and a skyrmion memory includes the magnetic storage media.

Magnetic storage media and data storage device

Provided is a skyrmion memory circuit capable of circularly transferring a magnetic element skyrmion, comprising one or more current paths in a magnet having a closed-path pattern that are provided surrounding an end region including an end portion of the magnet in a plane of the magnet with the closed-path pattern, and applying current between an outer terminal connected to an outer circumferential portion of the closed-path pattern and an inner circumference electrode connected to an inner circumferential portion of the closed-path pattern, transferring the skyrmion in a direction substantially perpendicular to the direction of the applied current, and circulating the skyrmion in the magnet with the closed-path pattern.

Magnetic element, skyrmion memory, solid-state electronic device data recording apparatus, data processing apparatus, and communication apparatus

A microcomputer system includes a master processor and a coprocessor interconnected via a bus. The coprocessor supplies first, second and third signals to the master process, the first (BUSY) signal taking an active level when the coprocessor requests a wait condition of the master processor, the second (CPERR) signal taking an active level at least when the first signal is changed to the inactive level in a state of occurrence of an arithmetic exception in the coprocessor, and the third (CPEND) signal taking an active level when the coprocessor is free of execution of an instruction and of an occurrence of an arithmetic exception. When the coprocessor executes an instruction whose execution result is not required to be returned to the master processor, the master processor detects the level of the third signal and if the third signal is at the active level, the master processor starts to execute subsequent instructions irrespective of the first and second signals, in parallel with the execution of the instruction by the coprocessor.

Microcomputer system including a master processor and a slave processor

A microprocessor having a multi-stage pipeline structure, comprises: a status flip-flop having its output changing when the instruction code of a predetermined instruction is decoded in the microprocessor; a circuit for outputting the output of the status flip-flop in synchronism with the output timing of an address for the bus cycle period of the microprocessor; and a circuit for sequentially storing the information, which appears at the input/output terminals of the microprocessor, as time-series data outside of the microprocessor. The time-series data is edited by discriminating the bus cycle of the microprocessor belongs to the bus cycle following an instruction on or before the predetermined instruction for changing the output of the status flip-flop or the bus cycle following an instruction on or after the predetermined instruction, with reference to the information outputted from the status flip-flop inside of the microprocessor to the outside of the same.

Data processing system with a pipelined structure for editing trace

A rounding unit for use in arithmetic processing of register floating point data. The rounding unit comprises a mantissa part register for storing the mantissa part of the floating point data, an exponent part register for storing the exponent part of the floating point data, a judging circuit for judging whether the rounding operation is raising or truncating, a mantissa part incrementer for incrementing the mantissa part of the floating point data and outputting a carry signal when it is overflowed, an exponent part incrementer for incrementing the exponent part of the floating point data and a selection circuit which, in response to the carry signal from the mantissa part incrementer and the judging signal from the judging circuit, orders the mantissa part register to store a constant data of which the most significant bit is '1' and the other bits are '0', when the rounding operation is raising and the carry signal is present. For generating the constant data, a constant register or an adjusting means is employed. The rounding unit executes the rounding operation of floating point data by hardware and thus it operates at a very high speed.

Rounding unit for use in arithmetic processing of floating point data

A normalizing circuit is disclosed which can make bit shift operation for a bit string. The normalizing circuit has a leading 'one' detector, an encoder and a bit shifter. The leading 'one' detector detects a bit position of a leading 'one' among a bit string and produces a signal to indicate the bit position of the leading 'one'. The encoder produces a control signal by which bit shift operation is executed. The bit shifter has a plurality of shift paths to shift leftwardly or rightwardly the bit string such that the leading 'one' bit is positioned at the most left position or the most right position. One of the plurality of shift paths is selected by the control signal produced by the encoder. Thus, bit shift operation of the leading 'one' bit can be executed at a high speed.

Normalizing circuit

A microcomputer includes a central processing unit and at least one input-output (peripheral) unit selected by an address on a single semiconductor chip. The microcomputer further has an address changing circuit for assigning an arbitrary address to the input-output unit, so that the input-output address can be accessed by a variable address.

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Tokyo, Japan

Junichi Iwasaki