On the working zone of a magnetometer-electromagnet measuring device when using opposing pole pieces with flat surfaces

Objectives. The work set out to develop an approach for assessing the working (local) zone in magnetometerelectromagnet measuring devices designed for controlling the magnetic properties of samples in which the homogeneity of the magnetic field should be observed in terms of constancy of the field strength or induction.

Methods. The coordinate characteristics of the field strength (induction) between pole components were experimentally obtained to identify the desired working zone (in the vicinity of the minimum of each of these characteristics), taking into account the distance b between the poles and their diameter D.

Results. Data on working zones between opposing flat poles are obtained for different values b and D. With increased ratios b/D = 0.7–1.3, the size of the working zone concentrated in the middle axial part of the interpolar area is estimated at a value not exceeding 25–30% of the distance b such that the characteristic longitudinal size of the sample does not exceed 5–10 mm. As D increases and b/D decreases, the working area increases. In particular, at b/D ≅ 0.5, the size of the working area is estimated to be up to 90% and even 100% of the distance b.

Conclusions. A principled approach to the assessment of the working (axial) zone between opposing flat poles is demonstrated by obtaining and analyzing the necessary coordinate (significantly dependent on b and D) characteristics of the field strength (induction) between them. 

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