TY - GEN
T1 - Energy barrier and exchange coupling in spring-magnets
AU - Zeng, H.
AU - Shan, Z. S.
AU - Malhotra, S. S.
AU - Liu, J. P.
N1 - Publisher Copyright:
©2002 IEEE.
PY - 2002
Y1 - 2002
N2 - The exchange-coupled nanocomposite magnets have potential for high energy products because materials with this configuration may take the advantages of high magnetization of the soft magnetic constituents and the high coercivity of the hard constituents. From the physical point of view, the energy-barrier, EB, the minimum energy required for magnetization reversal, is the key issue in controlling the magnetic properties. In this paper, a modeling analysis of exchange coupling between the soft and hard magnetic layers, and the energy-barrier EB-S, EB-H is presented. We have derived the energy-barrier EB-S and EB-H as follows: EB-S= KStS{1-[H-(J/MStS)]/HK-S}2 (HK-S =2KS/MS; H < HC-S); EB-H =KHtH{1-[H+(J/MHtH)]/HK-H}2 (HK-H=2KH/MH; HC-S < HC-H); where M, K, t, and Hc are the magnetization, anisotropy constant, layer-thickness and coercivity, respectively, and the subscript S and H denote the soft and hard constituents. J is the exchange-coupling constant between the hard and the soft phase layers. It is seen from these equations that the energy-barrier of the soft-layer EB-S increases with J and the energy-barrier of the hard-layer EB-H decreases with J.
AB - The exchange-coupled nanocomposite magnets have potential for high energy products because materials with this configuration may take the advantages of high magnetization of the soft magnetic constituents and the high coercivity of the hard constituents. From the physical point of view, the energy-barrier, EB, the minimum energy required for magnetization reversal, is the key issue in controlling the magnetic properties. In this paper, a modeling analysis of exchange coupling between the soft and hard magnetic layers, and the energy-barrier EB-S, EB-H is presented. We have derived the energy-barrier EB-S and EB-H as follows: EB-S= KStS{1-[H-(J/MStS)]/HK-S}2 (HK-S =2KS/MS; H < HC-S); EB-H =KHtH{1-[H+(J/MHtH)]/HK-H}2 (HK-H=2KH/MH; HC-S < HC-H); where M, K, t, and Hc are the magnetization, anisotropy constant, layer-thickness and coercivity, respectively, and the subscript S and H denote the soft and hard constituents. J is the exchange-coupling constant between the hard and the soft phase layers. It is seen from these equations that the energy-barrier of the soft-layer EB-S increases with J and the energy-barrier of the hard-layer EB-H decreases with J.
UR - https://www.scopus.com/pages/publications/85017112124
U2 - 10.1109/INTMAG.2002.1000679
DO - 10.1109/INTMAG.2002.1000679
M3 - Conference contribution
AN - SCOPUS:85017112124
T3 - INTERMAG Europe 2002 - IEEE International Magnetics Conference
BT - INTERMAG Europe 2002 - IEEE International Magnetics Conference
A2 - Fidler, J.
A2 - Hillebrands, B.
A2 - Ross, C.
A2 - Weller, D.
A2 - Folks, L.
A2 - Hill, E.
A2 - Vazquez Villalabeitia, M.
A2 - Bain, J. A.
A2 - De Boeck, Jo
A2 - Wood, R.
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2002 IEEE International Magnetics Conference, INTERMAG Europe 2002
Y2 - 28 April 2002 through 2 May 2002
ER -