公开(公告)号：US3837908A

公开(公告)日：1974-09-24

申请号：US30291372

申请日：1972-11-01

Applicant: CALIFORNIA INST OF TECHN

Inventor： LEWICKI G ,  GUISINGER J

IPC: G03G5/16 ,  H01F10/12 ,  H01F10/02

CPC classification number: G03G5/16 ,  H01F10/12

Abstract: Manganese bismuth films having improved characteristics for recording information by Curie-point switching, and especially for Curie-point recording of information in analogue form, can be produced by a vacuum deposition of Bi and Mn with an atomic ratio of Mn to Bi between 2 and 3.5 or 1.4 and 1.6, followed by a specialized heat treatment which includes very brief exposure to a temperature between about 275* and 300*C. Similar MnBi films can be produced more reliably and reproducibly if the initial Bi layer is annealed prior to deposition of the Mn layer. Such an annealing step renders most other factors of the processing relatively non-critical. Deposition of both initial layers is preferably carried out in a vacuum approaching 10 8 Torr, but at least traces of oxygen are then made available to the reaction site prior to the subsequent reaction of the Mn and Bi layers to form ferromagnetic MnBi.

Abstract translation: 通过居里点切换记录信息改善特性的锰铋膜，特别是用于模拟形式的信息的居里点记录，可以通过真空沉积原子比为Mn与Bi的原子比在2和2之间 3.5或1.4和1.6，然后进行专门的热处理，其包括非常短暂的暴露于约275℃和300℃之间的温度。如果初始Bi层在沉积之前退火，则可以更可靠地且可重复地制备类似的MnBi膜 Mn层。 这种退火步骤使处理的大多数其他因素相对不重要。 两个初始层的沉积优选在接近10 -8 Torr的真空中进行，但是在Mn和Bi层随后的反应之后，至少有痕量的氧气可用于反应部位以形成铁磁性MnBi。

公开(公告)号：US3775570A

公开(公告)日：1973-11-27

申请号：US3775570D

申请日：1972-02-25

Applicant: CALIFORNIA INST OF TECHN

Inventor： LEWICKI G ,  GUISINGER J

IPC: G11B11/105 ,  G11B11/10

CPC classification number: G11B11/10532 ,  G11B11/10515 ,  G11B11/10543

Abstract: In a magneto-optic readout system, a polarized beam of light from a laser is subjected to the magneto-optic effect of a magnetic record medium, and then passed through an analyzer which resolves the beam into two orthogonal vector components so oriented that the two components are of equal amplitude when the angle of rotation due to the magneto-optic effect is zero. Separate photodetectors produce two output signals which are proportional to the amplitudes of the vector components. The two output signals are combined in a differential amplifier through separate logarithmic transfer circuits to produce an output signal proportional to the ratio of the two original detector signals.

Abstract translation: 在磁光读出系统中，来自激光器的偏振光束经受磁记录介质的磁光效应，然后通过分析器，该分析器将光束分解为两个正交矢量分量，使得两个 当由于磁光效应引起的旋转角为零时，分量具有相等的幅度。 单独的光电探测器产生与矢量分量的幅度成比例的两个输出信号。 两个输出信号通过单独的对数传输电路组合在差分放大器中，以产生与两个原始检测器信号的比率成比例的输出信号。