公开(公告)号：US4902583A

公开(公告)日：1990-02-20

申请号：US319597

申请日：1989-03-06

申请人： Charles F. Brucker ,  Frederick E. Spada

发明人： Charles F. Brucker ,  Frederick E. Spada

IPC分类号： G11B5/66 ,  G11B5/64 ,  G11B5/738 ,  G11B5/85 ,  H01F10/16 ,  H01F10/30 ,  H01F41/18

CPC分类号： H01F10/30 ,  H01F10/16 ,  H01F41/18 ,  Y10S428/928 ,  Y10T428/1284 ,  Y10T428/12854 ,  Y10T428/12861

摘要： A 3,000-10,000 angstrom thick cobalt-platinum (CoPt) magnetic film is deposited onto a chromium (Cr) or tungsten (W) overlayer on a substrate, or is deposited directly onto the substrate. The deposited film has an appreciable component of its C-axis, which is parallel to the [00.2] direction, lying in the plane of the film. The component of the C-axis lies in the plane of the film throughout the entire thickness of the CoPt film, and the resultant magnetic film has a coercivity from 1,300-2,000 oersteds, depending upon which, if any, overlayer is included.The method for producing the magnetic film of the invention teaches sputtering the overlayer onto a substrate maintained approximately at room temperature in an atmosphere of inert gas. After ajdusting the pressure of the gas and controlling the distance between the CoPt sputtering target and the substrate, CoPt is sputtered such that the depositing Co and Pt atoms are thermalized while traversing the distance between the target and the substrate.The film as deposited is magnetically isotropic in the plane, and may configured as a permanent magnet having a resultant magnetization in the plane by exposure to an external magnetizing field oriented along the film plane.

摘要翻译： 将3,000-10,000埃厚的钴 - 铂（CoPt）磁性膜沉积在基底上的铬（Cr）或钨（W）覆盖层上，或直接沉积在基底上。 沉积膜具有平行于[00.2]方向的C轴的明显分量，位于膜的平面中。 C轴的成分位于CoPt膜的整个厚度的膜的平面内，并且所得的磁性膜的矫顽力为1300-2000奥斯特，这取决于包括的覆盖层（如果有的话）。 本发明的磁性膜的制造方法教导了在惰性气体气氛中将覆盖层溅射到保持在大约室温的基板上。 在搅拌气体的压力并控制CoPt溅射靶和衬底之间的距离之后，CoPt被溅射，使得沉积Co和Pt原子在穿过靶和衬底之间的距离的同时进行热化。 沉积的膜在平面中是磁性各向同性的，并且可以被配置为通过暴露于沿着膜平面定向的外部磁化场而在平面中具有所得磁化的永磁体。

公开(公告)号：US4931892A

公开(公告)日：1990-06-05

申请号：US225127

申请日：1988-07-28

申请人： Frederick E. Spada

发明人： Frederick E. Spada

IPC分类号： G11B5/39 ,  G11B5/40

CPC分类号： G11B5/3903 ,  G11B5/39 ,  G11B5/40

摘要： In a MR head of the non-shunt bias type, one or more extremely thin coatings of a sacrificial conductive material are applied on the magnetoresistive strip, each such coating being so thin that it has extremely high sheet resistance in comparison to the sheet resistance of the MR strip. Because the sacrificial coating(s) is (are) in direct contact with the MR strip, the requirement for electrical conductivity between the coating(s) and the MR strip is (are) met; and because the sacrificial coating(s) is (are) of high resistivity, very little sense current is sapped away from the MR strip by the sacrificial coating(s), with attendantly very little decrease in the sensitivity of the head. By sandwiching the MR strip between equi-thick sacrificial coatings, whatever leakage currents flow through the high resistivity sacrificial coatings are productive of equal and opposite biasing effects vis-a-vis the MR strip, i.e. the sacrificial coatings produce no net bias field and are magnetically transparent to the MR strip.

摘要翻译： 在非分流偏置型的MR头中，牺牲导电材料的一个或多个非常薄的涂层施加在磁阻带上，每个这样的涂层如此薄，使得其具有非常高的薄层电阻， MR条。 由于牺牲涂层与MR条直接接触，所以要满足涂层和MR条之间的导电性要求; 并且由于牺牲涂层具有高电阻率，所以通过牺牲涂层将很少的感测电流从MR条带吸收掉，同时头部的灵敏度随之降低很少。 通过将MR带夹在等厚牺牲涂层之间，无论流过高电阻率牺牲涂层的泄漏电流是如何产生与MR带相同和相反的偏置效应，即牺牲涂层不产生净偏置场，并且 对MR带磁性透明。