摘要:

Aluminum thin films were electrically stressed in a high‐vacuum furnace and the damage resulting from the electromigration of aluminum ions was monitored by the change in stripe resistance. When high‐purity oxygen was periodically bled into the furnace,R˙ranged between a constant value and zero, depending on the magnitude of &Dgr;R. The proposed model suggests the stabilization of microscopic voids by the formation of a thin oxide film on the void surface.

ISSN:0003-6951    

DOI:10.1063/1.1654005

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A gas laser which oscillates on either the 5‐&mgr; CO or the 10‐&mgr; CO2lines has been developed. The laser is sealed off, operates at room temperature, and has given over 4‐W total power, alternatively at 5 and 10 &mgr;. Preliminary results indicate that performance characteristics and lifetimes comparable with conventional CO2lasers should be achievable.

ISSN:0003-6951    

DOI:10.1063/1.1654006

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A thermal model is presented to explain the recently observed current‐controlled negative resistance in single crystals of Si‐doped YIG. Steady‐stateI‐Vcharacteristics are calculated from electrical and thermal conductivity data and are compared with the observed curve. The agreement between theory and experiment is excellent.

ISSN:0003-6951    

DOI:10.1063/1.1654007

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Domain spacing in SmCo5is observed to increase by a factor of 1.5 at 78 K as compared with the spacing at room temperature. This indicates a difference in domain wall energy, which may explain the experimentally found difference in coercive force.

ISSN:0003-6951    

DOI:10.1063/1.1654008

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A new processing method for producing multifilamentary A‐15 superconducting composite wires in a ductile matrix is described. Nb3Sn made in this way was found to have a critical temperature of 17.5 K and a critical current density of 7.5×105A/cm2at 40 kG when suitably heat treated. The composite conductor could be bent with a radius of 2 cm or greater without appreciable degradation of its current‐carrying capacity.

ISSN:0003-6951    

DOI:10.1063/1.1654009

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

It is observed that the barrier height in Al‐(Al‐oxide)‐Al sandwiches is a strong function of the Al‐oxide thickness; it is also a strong function of the illumination, particularly at low temperatures. These results offer conclusive evidence that the effect is due to space charge trapped in the Al‐oxide.

ISSN:0003-6951    

DOI:10.1063/1.1654010

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The magnetic moment and hysteresis properties of a high‐density nearly completely oriented Co5Sm magnet alloy have been measured from 300 to 4.2 K and in applied fields up to 140 kOe. A saturation moment per gram of 98 G cm3/g is measured at 300 K and shows a slight increase as temperature is decreased. After adjustment for voids and oxide, the saturation moment per gram of the Co&sngbnd;Sm alloy is 102 G cm3/g, or equivalent to 11 000 G for the saturation magnetization 4&pgr;Js. An energy product of approximately 24 MG Oe is attained at 300 K.

ISSN:0003-6951    

DOI:10.1063/1.1654011

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Current‐voltage measurements and radiotracer experiments have been carried out to examine the nature of the passivation mechanism responsible for the reduction of sodium ion instabilities in MOS structures prepared from oxides grown in the presence of HCl. It has been found that the ions in the passivated oxides can still migrate to the vicinity of the silicon interface, but have no effect on the surface potential because they become neutralized, probably in the interaction with a chlorine‐associated species. The exact identity of this species and the details of the charge transfer to the Si electrode remain unresolved.

ISSN:0003-6951    

DOI:10.1063/1.1654012

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Thermomagnetic flux reversal has been studied in single‐crystal layers of Y3Ga1.1Fe3.9O12with 5‐&mgr;m thickness, prepared by liquid‐phase epitaxy (LPE) on a (111) Gd3Ga5O12wafer. By structuring the layers in a checkerboard pattern of squares with 10‐&mgr;m periodicity and 2‐&mgr;m width and depth of the surface grooves, arbitrary stable domain patterns have been obtained. Individual squares have been switched magnetically using heat pulses from a laser beam of 20‐mW intensity at 5145‐Å wavelength with fields as low as 13 Oe in case of a nearly demagnetized domain distribution. The beam energy for reversing the magnetization of a square is below 1 erg.

ISSN:0003-6951    

DOI:10.1063/1.1654013

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

We propose an ultrafast shutter, based on the saturable properties of polymethine cyanide dyes, with a variable shutter speed of 10–40 psec and more. With this, one can measure the pulse duration of the mode‐locked ruby laser pulse. We can also deduce the fluorescence decay time of these solutions employed.

ISSN:0003-6951    

DOI:10.1063/1.1654014

出版商:AIP    

年代:1972

数据来源: AIP