Permanent magnet motors have been considered for a variety of applications due to their features such as high power density and high efficiency. One of the issues that should be investigated in the design of these motors is the demagnetization problem. Usually, the demagnetization analysis is carried out in a steady state, while demagnetization effect in dynamic condition is more considerable d...

We hereby demonstrate that 1H detected 15N-1H heteronuclear multiple-quantum spectroscopy can be carried out at a magic angle spinning frequency of 150 kHz. While the coherences directly excited from dipolar order created by method adiabatic demagnetization in rotating frame, it is technically more advantageous to acquire chemical shift evolution coherence two separate periods for and 15N. also...

We present the design and performance of an ultra-high vacuum (UHV) scanning tunneling microscope (STM) that uses adiabatic demagnetization electron magnetic moments for controlling its operating temperature in range between 30 mK 1 K with accuracy up to 7 $\mu$K. The time available STM experiments at 50 is longer than 20 h, 100 about 40 h. single-shot refrigerator (ADR) can be regenerated auto...

The relationship of permanent magnetic material characteristic parameters was analyzed, and a simulation method of a permanent magnet synchronous motor (PMSM) rotor demagnetization fault was put forward. Based on this, a simulation model of the PMSM under partial demagnetization and uniform demagnetization fault were established, and different degrees demagnetization fault was simulated. Relati...

2014 An experimental study of the magnetic ordering of the proton spin system in Ca(OH)2 is presented. The ordered phase is reached via dynamic nuclear polarization followed by an adiabatic demagnetization in the rotating frame. The spin temperature is negative while the external magnetic field is parallel to the crystalline c-axis. Measurements of the magnetization parallel to the effective ma...

Magnetic refrigeration material is the key to adiabatic demagnetization technology. In this work, two magnetic refrigerants, Gd5(C4O4)(HCOO)3(CO3)2(OH)6·2.5H2O (1) and Gd2(OH)4SO4 (2), were prepared through hydrothermal reaction. study reveals that their entropy changes are 24.8 J kg−1 K−1 for 1 15.1 2 at K T, respectively. The of T = ∆H exceed most gadolinium hydroxyl compounds, indicating ref...