Single Crystal Anisotropy and Magnetostriction Constants of Several Ferromagnetic Materials Including Alloys of NiFe, SiFe, AlFe, CoNi, and CoFe

Abstract

The anisotropy and magnetostriction of single crystals of several ferromagnetic materials have been determined experimentally. The materials include the metals iron and nickel, binary alloys of nickel iron, silicon iron, aluminum iron, cobalt nickel, and cobalt iron, ternary alloys of molybdenum nickel iron, nickel cobalt iron, and molybdenum aluminum iron, and magnetite. The effect of the order-disorder reaction on these properties was measured for several of the alloys. The present data for the nickel iron and silicon iron systems agree well with recently published values. Ordering generally raises the magnetostriction and lowers the anisotropy of the aluminum iron alloys near the Fe3Al composition. The first anisotropy constant, K1, for the cobalt nickel system as derived from torque curves is similar to old data derived from magnetization curves. However, K1 for cobalt iron (30, 35, and 45% cobalt) appears to be considerably larger than previously reported. In general, the addition of cobalt to nickel and to iron changes the magnetostriction constants (λ100 and λ111) toward large positive values. Thus, λ100 increases to 100×10−6 for 50% cobalt nickel and to 130×10−6 for 45% cobalt iron; λ111 increases to 30×10−6 for 45% cobalt iron but remains approximately constant for the cobalt nickel alloys.

Giant magnetostriction in annealed Co1−xFex thin-films

“…In later experiments, Hall reported magnetostriction of λ 100~1 50 p.p.m. for annealed bulk single crystal Fe 0.5 Co 0.5 alloys 29,30 . Since then, several studies on alloys of the 50:50 composition in bulk 31,32 and thin films 10,11,13,33 have been reported, but little atten tion has been given to the other compositions in the phase diagram.…”

Construção de um transdutor quase-estatíco de tensão mecânica em propriedades magnéticas, aplicado a Liga (Fe0,8Al0,2)98.B2

“…Figura 4 -Em temperatura ambiente, magnetostricção de saturação nas direções cristalográficas [100] e [111], para ligas de Fe-Al, adaptado de [16] .…”

“…Neste caso, a maior deformação medida aconteceu com 19% (atômico) de alumínio para um resfriamento nem muito rápido e nem muito lento, gerando a coexistência da fase desordenada A2 e da ordenada D03 [16] .…”

“…(1 diminui e os domínios orientados paralelamente à força se deslocam para a base [1], [2], [3], [7], [10], [16] .…”

“…acomoda um atuador piezoelétrico ou magnetostrictivo (14), uma bucha (16), uma mola de compressão (16), uma agulha (9) e um tubo de alimentação de combustível (3), sendo ambos unidos por um elemento plástico (4) que possui um terminal de elétrico (5) conectado a linha de alimentação de energia do injetor de combustível. A Figura 24 mostra com mais detalhes os componentes da válvula de combustível [25] .…”