Presentation Information
[P1-46]A Compact 4 Tesla Permanent Magnet Field Source with Reduced Structural Complexity
*Min Zou1, Hui Meng2, Yan Shen3, George Mizzell4, Christina H Chen3 (1. Lab Magnetics Inc., San Jose, CA, USA (United States of America), 2. Foresee Group, Hangzhou, Zhejiang, China (China), 3. Quadrant Solutions Inc., San Jose, CA, USA (United States of America), 4. SuperMagnetMan, Pelham, AL, USA (United States of America))
Keywords:
Magnetic Field Source,Permanent Magnet Structure,Magnetic Flux Concentration,High Magnetic Field Generation,Finite Element Analysis (FEA),Nd-Fe-B Magnet Application,Rare Earth Permanent Magnet Application
Permanent magnet structures play a crucial role in generating magnetic fields for various applications [1]. Previous designs combining rare-earth permanent magnets and high-saturation soft magnetic materials have achieved measured fields up to 5.16 Tesla in a 2 mm gap using a 900 kg structure, which included 340 kg of permanent magnets [2]. A subsequent study theoretically predicted that a similar design with 350 kg of permanent magnets could generate a 7.4 Tesla field in a 2 mm gap [3]. More compact designs have demonstrated 4 and 5 Tesla fields in 1.5 mm (Φ6 mm) and 0.15 mm (Φ6 mm) gaps, respectively, using a 120 mm Nd-Fe-B magnet sphere composed of 192 segments, along with Fe-Co pole pieces and sample access apertures [4, 5].
We present a novel permanent magnet structure utilizing high performance Nd-Fe-B magnets (remanence: 1.45 T, normal coercivity: 1110 kA/m) and Fe-Co alloy (saturation magnetization: 2.3 T), optimized via finite element analysis (FEA) [6]. This compact design consists of 18 permanent magnet pieces and 6 Fe-Co pole pieces, with a form factor of 50×50×120 mm³ and a total weight of just 2.1 kg. Our simulations indicate magnetic fields of 4.20 Tesla in a 1.5 mm air gap (3×3×1.5 mm³ volume) and 3.96 Tesla in a 2.0 mm air gap (3×3×2.0 mm³ volume), as shown in Fig. 1. Compared to prior work, this design achieves a high field strength with significantly reduced size and structural complexity.
The potential applications of this compact high magnetic field source include small-sample MRI for biomedical research, magnetic manipulation of biological materials, and quantum computing/spintronics for qubit control. It may also support material and component testing, diagnostics, and magnetic field research for fusion reactor processes, among other possibilities.
References
[1] J.M.D. Coey, J. Magn. Magn. Mater. vol. 248, 441 (2002).[2] M. Kumada et al., Proc. 2003 Part. Accel. Conf., Portland, OR, USA, vol. 3, 1993 (2003).
[3] M. Kumada et al., IEEE Trans. Appl. Supercond., vol. 14, no. 2, 1287, (2004).
[4] O. Cugat and F. Bloch, Proc. 15th Int. Workshop Rare Earth Magn. Appl. 853 (1998).
[5] CERN Courier, vol.43, No3, p.7, (2002).
[6] Simcenter MAGNET software, version 2212.0004.
We present a novel permanent magnet structure utilizing high performance Nd-Fe-B magnets (remanence: 1.45 T, normal coercivity: 1110 kA/m) and Fe-Co alloy (saturation magnetization: 2.3 T), optimized via finite element analysis (FEA) [6]. This compact design consists of 18 permanent magnet pieces and 6 Fe-Co pole pieces, with a form factor of 50×50×120 mm³ and a total weight of just 2.1 kg. Our simulations indicate magnetic fields of 4.20 Tesla in a 1.5 mm air gap (3×3×1.5 mm³ volume) and 3.96 Tesla in a 2.0 mm air gap (3×3×2.0 mm³ volume), as shown in Fig. 1. Compared to prior work, this design achieves a high field strength with significantly reduced size and structural complexity.
The potential applications of this compact high magnetic field source include small-sample MRI for biomedical research, magnetic manipulation of biological materials, and quantum computing/spintronics for qubit control. It may also support material and component testing, diagnostics, and magnetic field research for fusion reactor processes, among other possibilities.
References
[1] J.M.D. Coey, J. Magn. Magn. Mater. vol. 248, 441 (2002).[2] M. Kumada et al., Proc. 2003 Part. Accel. Conf., Portland, OR, USA, vol. 3, 1993 (2003).
[3] M. Kumada et al., IEEE Trans. Appl. Supercond., vol. 14, no. 2, 1287, (2004).
[4] O. Cugat and F. Bloch, Proc. 15th Int. Workshop Rare Earth Magn. Appl. 853 (1998).
[5] CERN Courier, vol.43, No3, p.7, (2002).
[6] Simcenter MAGNET software, version 2212.0004.
