According to one embodiment, a magnetic recording device includes a magnetic head, a first circuit, a second circuit, a third circuit, and a controller. The magnetic head includes a first magnetic pole, a second magnetic pole, a magnetic element, and a coil. The magnetic element is located between the first magnetic pole and the second magnetic pole. The magnetic element includes a first magnetic layer. The first circuit is configured to supply a coil current to the coil. The second circuit is configured to supply an element current to the magnetic element. The third circuit is configured to detect an electrical resistance of the magnetic element. The controller is configured to control the element current by controlling the second circuit based on the electrical resistance detected by the third circuit.

According to one embodiment, a magnetic head includes a first magnetic pole, a second magnetic pole, and a stacked body provided between the first and second magnetic poles. The stacked body includes a first magnetic member, a second magnetic member provided between the first and second magnetic members, and a first layer provided between the first and second magnetic members, and including at least one selected from the group consisting of Cr, V, Mn, Ti and Sc. The first magnetic member includes first magnetic regions and a first non-magnetic region. A direction from one of the first magnetic regions toward another one of the first magnetic regions is along a first direction from the first magnetic pole toward the second magnetic pole. The first non-magnetic region is between the one of the first magnetic regions and the other one of the first magnetic regions.

The present disclosure relates to a magnetic recording head having an exchange biased leading shield or leading edge shield (LES). The LES is a bilayer structure. One or more layers are coupled below the LES such that the LES is disposed between the main pole and the one or more layers. The one or more layers exchange bias the LES such that the upper layer of the LES has a magnetization parallel to the magnetization of the trailing shield. The lower layer of the LES has a magnetization that is antiparallel to the magnetization of the upper layer of the LES. The one or more layers set the preferred direction for the lower layer of the LES and sets the LES as a two-domain state without relying upon the anisotropy field (Hk) of either the upper or lower layers of the LES.

According to one embodiment, a magnetic head includes first and second magnetic poles, a stacked body, and first to third terminals. The stacked body is provided between the first and second magnetic poles. The stacked body includes a first magnetic layer, a second magnetic layer between the first magnetic layer and the second magnetic pole, a third magnetic layer between the second magnetic layer and the second magnetic pole, a fourth magnetic layer between the third magnetic layer and the second magnetic pole, a first nonmagnetic layer between the first magnetic pole and the first magnetic layer, a second nonmagnetic layer between the first and second magnetic layers, a third nonmagnetic layer between the second and third magnetic layers, a fourth nonmagnetic layer between the third and fourth magnetic layers and a fifth nonmagnetic layer between the fourth magnetic layer and the second magnetic pole.

Aspects of the present disclosure generally relate to a magnetic recording head of a spintronic device, such as a write head of a data storage device, for example a magnetic media drive. In one example, a magnetic recording head includes a main pole, a trailing shield, and a spin torque layer (STL) between the main pole and the trailing shield. The magnetic recording head a first layer structure on the main pole, and the first layer structure includes a negative polarization layer. The magnetic recording head also includes a second layer structure disposed on the negative polarization layer and between the negative polarization layer and the STL. The negative polarization layer is an FeCr layer. The second layer structure includes a Cr layer disposed on the FeCr layer, and a Cu layer disposed on the Cr layer and between the Cr layer and the STL.

According to one embodiment, a magnetic head includes first and second magnetic poles, and a stacked body provided between the first and second magnetic poles. The stacked body includes a first magnetic layer, a second magnetic layer provided between the first magnetic layer and the second magnetic pole, a first nonmagnetic layer provided between the first and second magnetic layers, a second nonmagnetic layer provided between the second magnetic layer and the second magnetic pole, and a third nonmagnetic layer provided between the first magnetic pole and the first magnetic layer. The first magnetic layer includes a first element including at least one of Fe, Co, or Ni. The second magnetic layer includes (Fe.sub.100-xCo.sub.x).sub.100-yE.sub.y. A second element E includes at least one selected from the group consisting of Cr, V, Mn, Yi, and Sc. The first magnetic layer does not include the second element.

A method of designing a circuit is provided. The method includes: providing a circuit; selecting a first NMOS fin field-effect transistor (FinFET) in the circuit; and replacing the first NMOS FinFET having a first fin number with a second NMOS FinFET having a second fin number and a third NMOS FinFET having a third fin number, wherein the sum of the second fin number and the third fin number is equal to the first fin number.

The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a main pole (MP), a trailing shield (TS), a trailing gap (TG) disposed between the MP and the TS, and a spin torque oscillator (STO) disposed in the TG adjacent to the MP. A notch may be disposed in the TG between the STO and TS. The notch comprises one or more notch interlayers comprising a non-magnetic material and/or a magnetic material. A bump may be disposed in the TG between the TS and the STO or the notch. The bump comprises one or more bump interlayers comprising a non-magnetic material. A hot seed layer may be coupled to the TS adjacent to the bump, the notch, or the STO. The hot seed layer comprises one or more hot seed interlayers comprising a non-magnetic material.

A spin injection assisted magnetic recording structure is disclosed wherein a ferromagnetic (FM) layer and at least one spin preservation (SP) layer are formed between a main pole (MP) trailing side and a write shield (WS). Current (Ia) flows between the MP and WS, or is injected into the FM layer. As a result, the spin polarized electrons from the FM layer, which flow across one or two SP layers to generate a magnetization that enhances one or both of a local WS magnetization and return field, and a local MP magnetization and write field, respectively. A lead to the FM layer may be stitched to enable lower resistance and improve reliability. The FM layer may be recessed from the ABS to allow more overlap with the SP layer for lower current density while maintaining performance. Higher linear density and area density capability, and better reliability are achieved.

The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a main pole, an EAMR stack disposed on the main pole, and a trailing shield disposed on the EAMR stack. The EAMR stack comprises a seed layer disposed on the main pole, a spin torque layer disposed on the seed layer, and a spacer layer disposed on the spin torque layer. At least one surface of the spacer layer in contact with the spin torque layer has a smaller or reduced area than the spin torque layer. The at least one surface of the spacer layer in contact with the spin torque layer is recessed from a media facing surface and has a smaller cross-track width than the spin torque layer and a smaller width in the stripe height direction than the spin torque layer.