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MAGLAB - The Laboratory of Magnetism

Code: IMC-S-00-0071-FU

Institute of Physics

Contact Person:

Description:

The MAGLAB facilitates experimental material research of metallic soft-magnetic materials. The measuring setups are adapted for samples of toroidal and ribbon (tape) form. The range of methods in function now (November 1999) comprises:

• Automated (PC control) setup "ac amplitude permeability" enables it to investigate: -- permeability μor susceptibility x variation with exciting field H (H ranging from 1E-2 to 5E3 A/m). Measurements on toroids enable yet lower H-limit 1E-3 A/m and also sinu­soidal flux conditions. -- μ or x vs frequency f variation (f ranges from 2 to 1E5 Hz where f- and H- ranges limit each other above certain level) -- aftereffects (e.g. disaccommodation of μ or x) can be measured as well at room tem­perature (small toroids up to 120°C). -- response of x to bi-axial, in-plane stressing can be measured on potted thin ribbons /strips. (The stress range depends on samples" cross section - ±±50 MPa is achieved for cross section of ~2E-7 m2). The influence of the potting material can be tested too by this method.
• "Hysteresisgraph" provides: --automatic recording of (digitized) ac repetitive or single-shot hysteresis loops with numeric or analog integration of induced signal. (f ranges from 1E-2 to 1E5 Hz; the need of magnetic saturation can lower the upper limit). -- response of the loop to stressing as for "ac amplitude permeability"

Both the above mentioned methods enable the determination of further deduced quantities as magnetic induction or magnetization, remanence, coercivity, core losses, magnetization work, etc.

The methods are supported by standard sample preparation technology inclusive toroidal core construction (thin ribbon-wound cores under controlled ribbon tension), encapsulation, potting of straight strips etc.. Thermal treatment up to 700°C in Ar or N2 atmosphere is also provided.

There are also "idling" methods that can be adapted and exploited if requested. Non-destructive continuous homogeneity test of continuous ribbon-shaped materials with 0.5 cm site-to-site resolution along the ribbon exploiting eddy-current excitation (indicates not only all the above magnetic parameters, but chemical/structural heterogeneity of even non-magnetic, poorly con­ductive materials). Thermo-magnetic treatment of toroids up to 7.5 cm o.d. in circumferen­tial field (up to 700 A/m, 700°C) and axial field (up to 14 kA/m, 450°C).

The MAGLAB staff is continuously engaged in applied research too and has acquired plenty of experience surpassing the limits of in-house experimental base. We are ready to apply also this experience to help to solve your problems.