A perpendicular field electromagnet with a 250 mm access bore

• Main Authors: Petrović, Alexander Paul, Smit, B. H. M., Fong, K. L., Satywali, Bhartendu, Tee, Xian Yang, Panagopoulos, Christos
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2021
• Subjects: Science::Physics; Thin Films; Electromagnetic Coils
• Online Access: https://hdl.handle.net/10356/146823
• Institution: Nanyang Technological University

We present a laboratory electromagnet capable of generating magnetic fields up to ±0.48 T, specifically designed as a perpendicular flux source for thin film samples in an ambient environment. The magnet features a 250 mm diameter clear access bore above the sample plane, thus offering compatibility with a wide variety of experimental apparatus. Despite its generous size, the magnet thermally dissipates less than 1 kW at maximum field. A shaped ferromagnetic core is used to amplify and homogenize the field B, leading to an estimated uniformity of ±1.5 mT (≲0.3%) in B within a 28 mm2 zone at maximum field. The sample stage is thermally regulated and isolated from the magnet, enabling temperature control with ±5 mK precision even at elevated magnetic fields.