Fuji Electric Co., Ltd.

Yasuaki Hozumi

Hirohisa Oyama

Satoshi Takahashi

Shunji Takenoiri

Fumihiko Momose

Sadayuki Watanabe

Toyoji Ataka

A semiconductor device encompasses a mounting member having a copper-based wiring layer; first covering layer which contains nickel, covering the wiring layer so that a part of upper surface of the wiring layer is exposed in opening; joint layer metallurgically joined to the wiring layer in the opening; second covering layer which contains nickel, metallurgically joined to the joint layer on upper surface of the joint layer; semiconductor chip having bottom surface covered with the second covering layer. The joint layer has lower layer in contact with the wiring layer, upper layer in contact with the second covering layer, and intermediate layer between the lower layer and the upper layer, the lower layer and the upper layer have intermetallic compounds as main components which contain tin, copper and nickel, and the intermediate layer is alloy containing tin as the main component and no lead.

Semiconductor device

A semiconductor module includes: a semiconductor device; a bonding layer that is arranged on the semiconductor device, and contains nickel or copper, an entire back surface of the bonding layer being electrically connected to and in direct contact with an electrode in the semiconductor device; an anti-oxidation layer disposed on the bonding layer; and a protective layer disposed directly on a top surface of a peripheral portion of the bonding layer on which the anti-oxidation layer is absent, covering an outer peripheral edge of the bonding layer, wherein the protective layer is made of an electrically insulating resin.

Semiconductor module and method of manufacturing semiconductor module

A semiconductor module includes: a semiconductor device; a bonding layer that is arranged on the semiconductor device, contains nickel or copper, and is electrically connected to the semiconductor device; a solder portion containing gold, disposed on the bonding layer; and a protective layer disposed directly on the bonding layer, covering an outer peripheral edge of the bonding layer.

A perpendicular magnetic recording medium exhibits reduced noise and improved performance in such measures as SN ratio, and can realize high magnetic recording densities. In the perpendicular magnetic recording medium, at least a first nonmagnetic intermediate layer, second nonmagnetic intermediate layer, and magnetic recording layer are stacked in order on a nonmagnetic substrate. The first nonmagnetic intermediate layer is formed from a CoCrRuW alloy, and the second nonmagnetic intermediate layer is formed from an Ru-base alloy.

Perpendicular magnetic recording medium and method of manufacturing same

This document discloses a perpendicular magnetic recording medium in which the magnetic anisotropy of a magnetic recording layer is raised and the thermal stability of recorded signals is improved without changing the conventional stacked configuration. A perpendicular magnetic recording medium is formed by stacking at least an intermediate layer, a second underlayer, and a magnetic recording layer in this order on a nonmagnetic base. The intermediate layer is either a single layer of Ru or a Ru-based alloy, or a stacked structure of a nonmagnetic alloy film including Co and Cr and a film of Ru or a Ru-based alloy. The second underlayer includes Co in the range from 30 at % to 75 at %, Cr in the range from 20 at % to 60 at %, and W in the range from 0.1 at % to 10 at %, and has a thickness in the range from 0.1 nm to 1.0 nm.

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Tokyo, Japan

Yasuaki Hozumi