engineering involving imaging of magnetization and current distributions. Applications have spanned many disciplines, from applied physics and materials science [1-6] to paleomagnetism and rock magnetism [7-11], biophysics [12-20], and nondestructive testing [21-26]. Instruments based on superconducting quantum interference device (SQUID) sensors currently yield the best field sensitivity but are bulky,
The electric field recorded in silica samples thermally poled during various intervals was measured by etching. The field is nearly uniform and increases to a maximum (∼3.6×108 V/m) in few minutes of poling and subsequently decreases slowly toward a steady level (∼1.4×108 V/m). The depletion layer becomes neutral even before the field reaches steady state. An upper limit of (0.7±0.2) μm was found for the thickness of the negatively charged edge of the depletion region. The value of χ(3) is the same for all poling times.
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