TY - GEN
T1 - Interelement spacing and angle effects on magnetic reversal in permalloy arrays
AU - Koo, H.
AU - Krafft, C.
AU - Gomez, R. D.
N1 - Publisher Copyright:
©2002 IEEE.
PY - 2002
Y1 - 2002
N2 - As high density integration of magnetic devices are realized, the role of interaction between small single domain islands becomes a very important concern. In a previous paper (IEEE Trans. Magn. vol.37, p.2049-2051, (2001)), we established that interconnected 30 nm thick Ni81Fe19 segments switch at a single field and the process appears to be governed by parallel rotation as described by modified Jacobs-Bean chain-of-spheres model. In this study, we focus on the switching characteristics of interelement submicron Ni81Fe19 segments as a function of spacing. A salient result is the increase of the switching field with decreasing spacing between the segments reaching the maximum value for zero spacing. Interestingly when the segments overlap, the switching field becomes lower than the maximum. In disjointed segments, effective external field is a combination of applied field and the monopolar stray-field from neighboring islands. In connected segments arrays, the spin-spin interaction dominates so that the switching field is determined by the reverse nucleation field at the ends of the array. We also investigated the reversal behavior of the connected segments as a function of the angle, α and the external field, H. The switching field dependence on α is also shown. The reversal field reaches minimum at 45°. A coherent rotation model which includes the effect of the array geometry will be used to explain these trends.
AB - As high density integration of magnetic devices are realized, the role of interaction between small single domain islands becomes a very important concern. In a previous paper (IEEE Trans. Magn. vol.37, p.2049-2051, (2001)), we established that interconnected 30 nm thick Ni81Fe19 segments switch at a single field and the process appears to be governed by parallel rotation as described by modified Jacobs-Bean chain-of-spheres model. In this study, we focus on the switching characteristics of interelement submicron Ni81Fe19 segments as a function of spacing. A salient result is the increase of the switching field with decreasing spacing between the segments reaching the maximum value for zero spacing. Interestingly when the segments overlap, the switching field becomes lower than the maximum. In disjointed segments, effective external field is a combination of applied field and the monopolar stray-field from neighboring islands. In connected segments arrays, the spin-spin interaction dominates so that the switching field is determined by the reverse nucleation field at the ends of the array. We also investigated the reversal behavior of the connected segments as a function of the angle, α and the external field, H. The switching field dependence on α is also shown. The reversal field reaches minimum at 45°. A coherent rotation model which includes the effect of the array geometry will be used to explain these trends.
UR - http://www.scopus.com/inward/record.url?scp=85017227677&partnerID=8YFLogxK
U2 - 10.1109/INTMAG.2002.1001213
DO - 10.1109/INTMAG.2002.1001213
M3 - Conference contribution
AN - SCOPUS:85017227677
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 -