Second‐Order Properties of Double‐Focusing Spectrometer with Nonuniform Magnetic Field

1958 ◽  
Vol 29 (11) ◽  
pp. 943-948 ◽  
Author(s):  
Hidetsugu Ikegami
Keyword(s):  
Magnetic Field ◽  
Second Order ◽  
Nonuniform Magnetic Field ◽  
Double Focusing

scholarly journals Reversibility of the Magnetocaloric Effect in the Bean-Rodbell Model

2021 ◽  
Vol 7 (5) ◽  
pp. 60
Author(s):  
Luis M. Moreno-Ramírez ◽  
Victorino Franco
Keyword(s):  
Magnetic Field ◽  
Thermal Hysteresis ◽  
Entropy Change ◽  
Second Order ◽  
Zero Field ◽  
First Order ◽  
Magnetic Field Change ◽  
Magnetocaloric Materials ◽  
Moderate Magnetic Field ◽  
The Magnetic Field

The applicability of magnetocaloric materials is limited by irreversibility. In this work, we evaluate the reversible magnetocaloric response associated with magnetoelastic transitions in the framework of the Bean-Rodbell model. This model allows the description of both second- and first-order magnetoelastic transitions by the modification of the η parameter (η<1 for second-order and η>1 for first-order ones). The response is quantified via the Temperature-averaged Entropy Change (TEC), which has been shown to be an easy and effective figure of merit for magnetocaloric materials. A strong magnetic field dependence of TEC is found for first-order transitions, having a significant increase when the magnetic field is large enough to overcome the thermal hysteresis of the material observed at zero field. This field value, as well as the magnetic field evolution of the transition temperature, strongly depend on the atomic magnetic moment of the material. For a moderate magnetic field change of 2 T, first-order transitions with η≈1.3−1.8 have better TEC than those corresponding to stronger first-order transitions and even second-order ones.

scholarly journals Thermoconvective instability of paramagnetic fluids in a nonuniform magnetic field

1998 ◽  
Vol 57 (5) ◽  
pp. 5564-5571 ◽  
Author(s):  
Jie Huang ◽  
Donald D. Gray ◽  
Boyd F. Edwards
Keyword(s):  
Magnetic Field ◽  
Nonuniform Magnetic Field ◽  
Thermoconvective Instability

Direct observation of abrupt shape transition in ferrogels induced by nonuniform magnetic field

1997 ◽  
Vol 106 (13) ◽  
pp. 5685-5692 ◽  
Author(s):  
M. Zrı́nyi ◽  
L. Barsi ◽  
D. Szabó ◽  
H.-G. Kilian
Keyword(s):  
Magnetic Field ◽  
Direct Observation ◽  
Nonuniform Magnetic Field ◽  
Shape Transition
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