Option of the Optical-mechanical Positioning of the Sensor and Sample in the Magnetometer. Determination of Magnetic Susceptibility of Powders and particlesAlexander Sandulyak, Anna Sandulyak, Dmitriy Kiselev, Maria Polismakova and Hasan BulutITM Web Conf., 22 (2018) 01013DOI: https://doi.org/10.1051/itmconf/20182201013