Abstract: A microwave assisted magnetic recording head includes a recording magnetic pole unit that produces a recording field for writing to a perpendicular magnetic recording medium, and a high-frequency magnetic field oscillator that produces a high-frequency magnetic field. The recording magnetic pole unit includes a magnetic core with a write gap portion at which a main recording field component is concentrated, and the high-frequency magnetic field oscillator is disposed in the write gap.

Abstract: Disclosed is a technique of providing a perpendicular magnetic recording medium in which high-quality servo information enabling high-density recording of 500 kTPI or more is recorded, and a magnetic storage device of an adaptive track formatting type having large capacity, high reliability and high performance with high device manufacturing yield. At a servo area of the perpendicular magnetic recording medium, a servo sequence such as a burst pattern for positioning in a servo track is recorded in a seamless manner without big recording footprint (several times longer than the servo bit) and in a magnetization pattern such that a total amount of the recording magnetization is substantially zero.

Abstract: There are provided a magnetic recording medium and a magnetic memory device capable of implementing high recording density, in the case of using a microwave assisted magnetic recording (MAMR) scheme. In a magnetic memory device including a magnetic recording medium having a recording film with three or more layers, a recording magnetic pole generating a recording magnetic field, an opposed magnetic pole, a high frequency magnetic field generating element generating a microwave for recording assist, and a magnetic reproduction element, an anisotropic field of a first layer which is a top layer of the recording film is larger than 20 kOe.

Abstract: Disclosed is a technique of providing a large-capacity magnetic storage device at high device manufacturing yield while keeping the reliability, the magnetic storage device enabling recording on a perpendicular magnetic recording medium having distribution of characteristics in the circumferential direction as well at high track density of 500 kTPI or more that would be expected from the average characteristics of the medium. A recording condition from is selected for each sector from a parameter table that stores a set of at least two types of recording conditions by a microwave assisted magnetic recording head including a magnetic recording pole and a high-frequency magnetic field oscillator in the magnetic storage device, and information is recorded for each sector based on the condition.

Abstract: In a Spin Torque Oscillator (STO) comprising an underlayer, a first magnetic layer disposed on the underlayer, a non-magnetic intermediate layer disposed on the first magnetic layer, and a second magnetic layer disposed on the non-magnetic intermediate layer, the non-magnetic intermediate layer is a non-magnetic alloy containing 50 at % or more of at least one kind of element selected from a first group consisting of Cu, Ag, and Au, and further at least 0.1 at % or more in total of at least one kind of element selected from a second group consisting of Cu, Ag, Au, Cr, Ti, Zr, Hf, V, Nb, Ta, Ru, Os, Pd, Pt, Rh, and Ir that does not overlap with the element from the first group.

Abstract: In one embodiment, a system includes a medium, a magnetic head having a write element adapted for writing data to the medium, a MAMR element and/or a TAMR element adapted for assisting recording on the medium, the MAMR element having a microwave-generating portion that receives current for operation thereof, the TAMR element having a localized heat-generating portion that receives current for operation thereof, and a read element adapted for reading data from the medium, a device adapted for measuring environmental conditions relating to the TAMR/MAMR elements and the medium, and a controller adapted for controlling operation of the magnetic head and adjusting operating parameters of the system based on the environmental conditions. The environmental conditions include temperature, a reproduced signal of the read element, and/or clearance between the TAMR/MAMR elements and the medium. The operating parameters include the clearance, amount of current injected to the TAMR/MAMR elements, and/or write current.

Abstract: Provided are a magnetic recording medium suitable for use with a microwave assisted magnetic recording head and suitable for such recording and a method for manufacturing the same. A perpendicular magnetic recording medium includes a recording layer including a plurality of magnetic layers. A magnetic layer as an uppermost layer of the recording layer includes three or more of sub-layers each having thickness of more than 0 and 1 nm or less, the sub-layers including a first sub-layer and a second sub-layer to make up a lamination unit layer, the first sub-layer including, as a major element, 50% or more of at least one type of element selected from the group consisting of Co, Fe and Ni, the second sub-layer including, as a major element, an element different from the major element of the first sub-layer.

Abstract: In a Spin Torque Oscillator (STO) comprising an underlayer, a first magnetic layer disposed on the underlayer, a non-magnetic intermediate layer disposed on the first magnetic layer, and a second magnetic layer disposed on the non-magnetic intermediate layer, the non-magnetic intermediate layer is a non-magnetic alloy containing 50 at % or more of at least one kind of element selected from a first group consisting of Cu, Ag, and Au, and further at least 0.1 at % or more in total of at least one kind of element selected from a second group consisting of Cu, Ag, Au, Cr, Ti, Zr, Hf, V, Nb, Ta, Ru, Os, Pd, Pt, Rh, and Ir that does not overlap with the element from the first group.

Abstract: A magnetic storage apparatus includes a magnetic recording medium, a microwave assisted magnetic recording head at least equipped with a magnetic recording pole that generates a recording magnetic field for writing to the magnetic recording medium and a high-frequency oscillator that generates a high-frequency field, a magnetic reproducing head that reads information from the magnetic recording medium, a signal processing unit that processes a signal written by the magnetic recording head and a signal read by the magnetic reproducing head and a unit that controls clearance between the high-frequency oscillator and the magnetic recording medium. The magnetic storage apparatus has a characteristic that the high-frequency oscillator is not operated except in recording.

Abstract: Disclosed is a technique of providing a large-capacity magnetic storage device at high device manufacturing yield while keeping the reliability, the magnetic storage device enabling recording on a perpendicular magnetic recording medium having distribution of characteristics in the circumferential direction as well at high track density of 500 kTPI or more that would be expected from the average characteristics of the medium. A recording condition from is selected for each sector from a parameter table that stores a set of at least two types of recording conditions by a microwave assisted magnetic recording head including a magnetic recording pole and a high-frequency magnetic field oscillator in the magnetic storage device, and information is recorded for each sector based on the condition.

Abstract: There are provided a magnetic recording medium and a magnetic memory device capable of implementing high recording density, in the case of using a microwave assisted magnetic recording (MAMR) scheme. In a magnetic memory device including a magnetic recording medium having a recording film with three or more layers, a recording magnetic pole generating a recording magnetic field, an opposed magnetic pole, a high frequency magnetic field generating element generating a microwave for recording assist, and a magnetic reproduction element, an anisotropic field of a first layer which is a top layer of the recording film is larger than 20 kOe.

Abstract: Disclosed is a technique of providing a perpendicular magnetic recording medium in which high-quality servo information enabling high-density recording of 500 kTPI or more is recorded, and a magnetic storage device of an adaptive track formatting type having large capacity, high reliability and high performance with high device manufacturing yield. At a servo area of the perpendicular magnetic recording medium, a servo sequence such as a burst pattern for positioning in a servo track is recorded in a seamless manner without big recording footprint (several times longer than the servo bit) and in a magnetization pattern such that a total amount of the recording magnetization is substantially zero.

Abstract: A microwave assisted magnetic recording head includes a recording magnetic pole unit that produces a recording field for writing to a perpendicular magnetic recording medium, and a high-frequency magnetic field oscillator that produces a high-frequency magnetic field. The recording magnetic pole unit includes a magnetic core with a write gap portion at which a main recording field component is concentrated, and the high-frequency magnetic field oscillator is disposed in the write gap.

Abstract: In one embodiment, a system includes a medium, a magnetic head having a write element adapted for writing data to the medium, a MAMR element and/or a TAMR element adapted for assisting recording on the medium, the MAMR element having a microwave-generating portion that receives current for operation thereof, the TAMR element having a localized heat-generating portion that receives current for operation thereof, and a read element adapted for reading data from the medium, a device adapted for measuring environmental conditions relating to the TAMR/MAMR elements and the medium, and a controller adapted for controlling operation of the magnetic head and adjusting operating parameters of the system based on the environmental conditions. The environmental conditions include temperature, a reproduced signal of the read element, and/or clearance between the TAMR/MAMR elements and the medium. The operating parameters include the clearance, amount of current injected to the TAMR/MAMR elements, and/or write current.

Abstract: A magnetic storage apparatus includes a magnetic recording medium, a microwave assisted magnetic recording head at least equipped with a magnetic recording pole that generates a recording magnetic field for writing to the magnetic recording medium and a high-frequency oscillator that generates a high-frequency field, a magnetic reproducing head that reads information from the magnetic recording medium, a signal processing unit that processes a signal written by the magnetic recording head and a signal read by the magnetic reproducing head and a unit that controls clearance between the high-frequency oscillator and the magnetic recording medium. The magnetic storage apparatus has a characteristic that the high-frequency oscillator is not operated except in recording.

Abstract: A magnetic recording and reading device includes a perpendicular magnetic recording medium, a perpendicular magnetic head having a recording head width having a heat-generating portion and a reading head, a fine adjustment portion, and a R/W-IC. The perpendicular magnetic head is configured to perform magnetic recording on the recording medium while locally heating the recording medium so as to enable a change of the coercive force of the recording medium during the recording after correcting of the position of the perpendicular magnetic head by the fine adjustment portion is completed, and to perform reading of the magnetic recording information with the aid of the reading head after correcting of the position of the perpendicular magnetic head by the fine adjustment portion is completed.

Abstract: A magnetic recording and reading device includes a perpendicular magnetic recording medium, a perpendicular magnetic head having a recording head width having a heat-generating portion and a reading head, a fine adjustment portion, and a R/W-IC. The perpendicular magnetic head is configured to perform magnetic recording on the recording medium while locally heating the recording medium so as to enable a change of the coercive force of the recording medium during the recording after correcting of the position of the perpendicular magnetic head by the fine adjustment portion is completed, and to perform reading of the magnetic recording information with the aid of the reading head after correcting of the position of the perpendicular magnetic head by the fine adjustment portion is completed.

Abstract: A magnetic recording and reading device includes a magnetic recording medium having at least one magnetic recording layer, a magnetic head enabling a data transfer rate of more than 50 MB/s and a recording density of more than 5 Gb/in2 on the magnetic recording medium, and a R/W-IC. The magnetic head includes a recording head and a reading head. The at least one magnetic recording layer contains (1) at least one metal element selected from a first group consisting of Co, Fe and Ni as a primary component, and (2) at least two elements selected from a second group consisting of Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf, Pd, Pt, Rh, Ir and Si.

Abstract: A magnetic recording and reading device includes a magnetic recording medium having at least one magnetic recording layer, a magnetic head enabling a data transfer rate of more than 50 MB/s and a recording density of more than 5 Gb/in2 on the magnetic recording medium, and a R/W-IC. The magnetic head includes a recording head and a reading head. The at least one magnetic recording layer contains (1) at least one metal element selected from a first group consisting of Co, Fe and Ni as a primary component, and (2) at least two elements selected from a second group consisting of Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf, Pd, Pt, Rh, Ir and Si.

Abstract: A magnetic recording and reading device includes a magnetic recording medium having a substrate and at least one magnetic recording layer formed above the substrate, a magnetic head enabling a data transfer rate of more than 50 MB/s and a recording density of more than 5 Gb/in2 on the magnetic recording medium, and a R/W-IC. The magnetic head includes a recording head and a reading head. The at least one magnetic recording layer contains (1) at least one metal element selected from a first group consisting of Co, Fe and Ni as a primary component, and (2) at least two elements selected from a second group consisting of Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf, Pd, Pt, Rh, Ir and Si.