Magnetic slider, head gimbal assembly and method for manufacturing the same
View Patent ↗Embodiments of the present invention provide a magnetic slider of which terminals have a sufficiently large process margin for the laser condition in the SBB process. According to one embodiment, a magnetic slider comprises: a read element and a write element; plural wiring lines which are connected to the read element and the write element; a protective film which covers the read element, the write element and the plural-wiring lines; plural slider pads formed on the protective film; and plural studs which respectively connect the slider pads and the wiring lines and are covered by the protective film, wherein each of the slider pads comprises a chromium film, a nickel iron film and a gold film, the nickel iron film is formed between the chromium film and the gold film, and the chromium film is formed between the nickel iron film and one of the studs and is in contact with the protective film.
1. A magnetic slider comprising:
a read element and a write element;
plural wiring lines which are connected to the read element and the write element;
a protective film which covers the read element, the write element and the plural wiring lines;
plural slider pads formed on the protective film; and
plural studs which respectively connect the slider pads and the wiring lines and are covered by the protective film;
wherein:
the plural slider pads are formed on a surface between an air bearing surface and a surface opposite to the air bearing surface;
each of the slider pads comprises a chromium film, a nickel iron film and a gold film;
the nickel iron film is formed between the chromium film and the gold film, wherein the gold film is in contact with the nickel iron film; and
the chromium film is formed between the nickel iron film and one of the studs and is in contact with the protective film, wherein the nickel content of the nickel iron film is not lower than 40% and not higher than 85% and wherein the chromium film has a thickness of 20-100 nm and wherein the gold film has a thickness of 1-10 μm.
2. A head gimbal assembly comprising:
a magnetic slider comprising;
a read element and a write element,
plural wiring lines which are connected to the read element and the write element,
a protective film which covers the read element, the write element and the plural wiring lines,
plural slider pads formed on the protective film, and
plural studs which respectively connect the slider pads and the wiring lines and are covered by the protective film; and
a suspension assembly comprising plural lead wires which are respectively connected to plural lead pads, a flexure and a load beam;
wherein:
each of the slider pads comprises a chromium film, a nickel iron film and a gold film;
the nickel iron film is formed between the chromium film and the gold film, wherein the gold film is in contact with the nickel iron film;
the chromium film is formed between the nickel iron film and one of the studs and is in contact with the protective film;
the slider pads are formed on a surface between an air bearing surface and a surface opposite to the air bearing surface; and
the surface of the magnetic slider opposite to the air bearing surface is attached to the flexure, and the slider pads are respectively connected to the lead pads by melting solder balls, wherein the nickel content of the nickel iron film is not lower than 40% and not higher than 85% and wherein the chromium film has a thickness of 20-100 nm and wherein the gold film has a thickness of 1-10 μm.
3. A method for manufacturing a head gimbal assembly, the method comprising the steps of:
fabricating a magnetic slider comprising;
a read element and a write element,
plural wiring lines which are connected to the read element and the write element,
a protective film which covers the read element, the write element and the plural wiring lines,
plural slider pads formed on the protective film, and
plural studs which respectively connect the slider pads and the wiring lines and are covered by the protective film; and
attaching the magnetic slider to a flexure of a suspension assembly comprising plural lead wires which are respectively connected to plural lead pads, the flexure and a load beam, placing solder balls respectively between the slider pads and the lead pads and irradiating the solder balls by a laser;
wherein:
each of the slider pads comprises a chromium film, a nickel iron film and a gold film;
the nickel iron film is formed between the chromium film and the gold film, wherein the gold film is in contact with the nickel iron film; and
the chromium film is formed between the nickel iron film and one of the studs and is in contact with the protective film wherein the nickel content of the nickel iron film is not lower than 40% and not higher than 85% and wherein the chromium film has a thickness of 20-100 nm and wherein the gold film has a thickness of 1-10 μm.