THE DESIGN AND TESTING OF AN ALTERNATING-FIELD DEMAGNETIZING APPARATUS

1965 ◽  
Vol 2 (6) ◽  
pp. 684-696 ◽  
Author(s):  
A. Larochelle ◽  
R. F. Black
Keyword(s):  
Field Intensity ◽  
Remanent Magnetization ◽  
High Peak ◽  
Geological Survey ◽  
Design And Testing ◽  
Peak Field

An apparatus used at the Geological Survey of Canada for magnetic cleaning purposes is described. With this apparatus viscous components of remanent magnetization were effectively removed from a group of uniformly magnetized specimens although an appreciable scattering in magnetization directions was observed after treatment at high peak field intensity. Tests were conducted to verify that the scattering was not inherent in the design of the apparatus.

Periodic permanent magnet focusing system with high peak field

2008 ◽  
Vol 320 (10) ◽  
pp. 1675-1679 ◽  
Author(s):  
Zhang Hong ◽  
Liu Weiwei ◽  
Bai Shuxin ◽  
Chen Ke
Keyword(s):  
Permanent Magnet ◽  
High Peak ◽  
Peak Field

Evidence for changes in the Earth’s magnetic field intensity

1970 ◽  
Vol 269 (1193) ◽  
pp. 47-55 ◽  
Keyword(s):  
Magnetic Field ◽  
Field Intensity ◽  
Remanent Magnetization ◽  
Magnetic Field Intensity ◽  
Earth’S Magnetic Field ◽  
The Past ◽  
Earth's Magnetic Field ◽  
Historical Past ◽  
Archaeological Objects ◽  
Periodical Change

Archaeomagnetic investigations based on the measurement of remanent magnetization in baked archaeological objects and rocks show considerable changes in the Earth’s magnetic field in the historical past. The curve characterizing the Earth’s intensity during the past 8500 years has its maximum around 400 to 100 b. c. when the field reaches 1.6 times its present intensity and its minimum around 4000 b. c.when the field drops to around 0.6 times its present intensity. On the smoothed curves with a periodical change of approximately 8900 years, changes with shorter periods are superimposed which can also be observed in declination and inclination. Results of archaeomagnetic investigations of samples from different areas on the Earth’s surface are discussed with the aim of defining the whole world and non­-dipole changes in the field moment. Possible connexions between the Earth’s magnetic field and 14 C decay are discussed on the basis of magnetic results, and the approximate character of changes in the Earth’s field during the past 20000 years is given.

Grain separation enhanced magnetic coercivity in Pt/Co multilayers.

1993 ◽  
Vol 51 ◽  
pp. 1038-1039 ◽  
Author(s):  
G.A. Bertero ◽  
R. Sinclair
Keyword(s):  
Remanent Magnetization ◽  
Strong Influence ◽  
Uniaxial Anisotropy ◽  
Magnetic Coupling ◽  
Recording Media ◽  
Magnetic Media ◽  
Signal To Noise ◽  
Out Of Plane ◽  
Longitudinal Recording ◽  
The Relationship

Pt/Co multilayers displaying perpendicular (out-of-plane) magnetic anisotropy and 100% perpendicular remanent magnetization are strong candidates as magnetic media for the next generation of magneto-optic recording devices. The magnetic coercivity, Hc, and uniaxial anisotropy energy, Ku, are two important materials parameters, among others, in the quest to achieving higher recording densities with acceptable signal to noise ratios (SNR). The relationship between Ku and Hc in these films is not a simple one since features such as grain boundaries, for example, can have a strong influence on Hc but affect Ku only in a secondary manner. In this regard grain boundary separation provides a way to minimize the grain-to-grain magnetic coupling which is known to result in larger coercivities and improved SNR as has been discussed extensively in the literature for conventional longitudinal recording media.We present here results from the deposition of two Pt/Co/Tb multilayers (A and B) which show significant differences in their coercive fields.

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