Knowledge (XXG)

Coercivity

Source πŸ“

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motion. When the magnetization of a material reverses by rotation, the magnetization component along the applied field is zero because the vector points in a direction orthogonal to the applied field. When the magnetization reverses by domain wall motion, the net magnetization is small in every
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The coercivity of a material depends on the time scale over which a magnetization curve is measured. The magnetization of a material measured at an applied reversed field which is nominally smaller than the coercivity may, over a long time scale, slowly
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by a strong field. This demagnetizing field is applied opposite to the original saturating field. There are however different definitions of coercivity, depending on what counts as 'demagnetized', thus the bare term "coercivity" may be ambiguous:
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M. S. Miller-F. E. Stageberg-Y. M. Chow-K. Rook-L. A. Heuer; Stageberg; Chow; Rook; Heuer (1994). "Influence of rf magnetron sputtering conditions on the magnetic, crystalline, and electrical properties of thin nickel films".
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M. A. Akhter-D. J. Mapps-Y. Q. Ma Tan-Amanda Petford-Long-R. Doole; Mapps; Ma Tan; Petford-Long; Doole (1997). "Thickness and grain-size dependence of the coercivity in permalloy thin films".
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and domain wall motion. The coercivity is a measure of the degree of magnetic hysteresis and therefore characterizes the lossiness of soft magnetic materials for their common applications.
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are found in relatively perfect magnetic materials used in fundamental research. Domain wall motion is a more important reversal mechanism in real engineering materials since defects like
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Nakamura, H.; Kurihara, K.; Tatsuki, T.; Sugimoto, S.; Okada, M.; Homma, M. (October 1992). "Phase Changes and Magnetic Properties of Sm 2 Fe 17 N x Alloys Heat-Treated in Hydrogen".
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that is performed on the material by the external field in reversing the magnetization, and is dissipated as heat. Common dissipative processes in magnetic materials include
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The distinction between the normal and intrinsic coercivity is negligible in soft magnetic materials, however it can be significant in hard magnetic materials. The strongest
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de Campos, M. F.; Landgraf, F. J. G.; Saito, N. H.; Romero, S. A.; Neiva, A. C.; Missell, F. P.; de Morais, E.; Gama, S.; Obrucheva, E. V.; Jalnin, B. V. (1998-07-01).
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Genish, Isaschar; Kats, Yevgeny; Klein, Lior; Reiner, James W.; Beasley, M. R. (2004). "Local measurements of magnetization reversal in thin films of SrRuO
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Jiang, H.; Evans, J.; O’Shea, M.J.; Du, Jianhua (2001). "Hard magnetic properties of rapidly annealed NdFeB thin films on Nb and V buffer layers".
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Rani, R.; Hegde, H.; Navarathna, A.; Cadieu, F. J. (15 May 1993). "High coercivity Sm 2 Fe 17 N x and related phases in sputtered film samples".
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Graphical definition of different coercivities in flux-vs-field hysteresis curve (B-H curve), for a hypothetical hard magnetic material.
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domain walls in addition to nucleating them. The dynamics of domain walls in ferromagnets is similar to that of grain boundaries and
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vector direction because the moments of all the individual domains sum to zero. Magnetization curves dominated by rotation and
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sites for reversed-magnetization domains. The role of domain walls in determining coercivity is complicated since defects may
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magnetic recording, compounded by the fact that increased storage density typically requires a higher coercivity in the media.
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of the magnetization of a ferromagnet measured along the applied field direction is zero. There are two primary modes of
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is present in the sample, the coercivities measured in increasing and decreasing fields may be unequal as a result of the
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Bai, G.; Gao, R.W.; Sun, Y.; Han, G.B.; Wang, B. (January 2007). "Study of high-coercivity sintered NdFeB magnets".
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C. D. Fuerst-E. G. Brewer; Brewer (1993). "High-remanence rapidly solidified Nd-Fe-B: Die-upset magnets (invited)".
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Kneller, E. F.; Hawig, R. (1991). "The exchange-spring magnet: a new material principle for permanent magnets".
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Equivalent definitions for coercivities in terms of the magnetization-vs-field (M-H) curve, for the same magnet.
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field) required to demagnetize that material, after the magnetization of the sample has been driven to
58:. The wider the outside loop is, the higher the coercivity. Movement on the loops is counterclockwise. 1657: 1626: 1595: 1560: 1529: 1429: 1380: 1318: 1283: 1211: 1176: 1040: 1001: 862: 719: 654: 130: 1100:
Luo, Hongmei; Wang, Donghai; He, Jibao; Lu, Yunfeng (2005). "Magnetic Cobalt Nanowire Thin Films".
626: 665:. The increasing value of coercivity at high frequencies is a serious obstacle to the increase of 923: 662: 658: 168: 1445: 1117: 1073: 1067: 968: 833: 808: 758: 754: 682: 310: 114: 1665: 1634: 1603: 1568: 1537: 1495:
Chen, Min; Nikles, David E. (2002). "Synthesis, self-assembly, and magnetic properties of Fe
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The saturation remanence and coercivity are figures of merit for hard magnets, although
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Resistance of a ferromagnetic material to demagnetization by an external magnetic field
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to zero. Relaxation occurs when reversal of magnetization by domain wall motion is
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Typically the coercivity of a magnetic material is determined by measurement of the
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process, the area inside the magnetization curve during one cycle represents the
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Hysteresis in Magnetism: For Physicists, Materials Scientists, and Engineers
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also fall to zero (the material reaches the origin in the hysteresis curve).
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Yang, M.M.; Lambert, S.E.; Howard, J.K.; Hwang, C. (1991). "Laminated CoPt
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This article is about the property of magnetic fields. For other uses, see
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For a table of coercivities of various magnetic recording media, see "
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Gaunt, P. (1986). "Magnetic viscosity and thermal activation energy".
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Ferromagnetic materials with high coercivity are called magnetically
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Zhenghong Qian; Geng Wang; Sivertsen, J.M.; Judy, J.H. (1997). "Ni
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since both domain walls and grain boundaries are planar defects.
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Livingston, J. D. (1981). "A review of coercivity mechanisms".
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ferrite thin films prepared by Facing Target Sputtering".
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is also commonly quoted. The 1980s saw the development of
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hard magnets with high coercivities have been developed.
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Handbook of Charged Particle Optics, Second Edition
1685:Magnetization reversal applet (coherent rotation) 1167:/Cr films for low noise longitudinal recording". 1346:IEEE Translation Journal on Magnetics in Japan 796: 794: 757:with high energy products but undesirably low 297:field is finally returned to zero, then both 8: 1484: 1691:Degaussing Data Storage Tape Magnetic Media 1311:Journal of Magnetism and Magnetic Materials 1276:Journal of Magnetism and Magnetic Materials 1262: 327: 313:lose almost none of the magnetization at 537: 533: 329:Coercivities of some magnetic materials 790: 1462: 7: 967:Thompson, Silvanus Phillips (1896). 89:. Coercivity is usually measured in 1102:The Journal of Physical Chemistry B 888:Calvert, J. B. (6 December 2003) . 269:field inside the material) to zero. 241:field inside the material) to zero. 77:, is a measure of the ability of a 1240:. Wondermagnet.com. Archived from 125:material to withstand an external 81:material to withstand an external 14: 830:Handbook of magnetic measurements 30:A family of hysteresis loops for 801:Giorgio Bertotti (21 May 1998). 199:is the intensity of the applied 1136:"Cast ALNICO Permanent Magnets" 926:. Hyperphysics.phy-astr.gsu.edu 924:"Magnetic Properties of Solids" 293:to zero, meaning that when the 32:grain-oriented electrical steel 1618:IEEE Transactions on Magnetics 1169:IEEE Transactions on Magnetics 1033:IEEE Transactions on Magnetics 1: 1331:10.1016/S0304-8853(01)00017-8 832:. Boca Raton, FL: CRC Press. 700:magnetocrystalline anisotropy 289:field required to reduce the 261:field required to reduce the 233:field required to reduce the 1143:Arnold Magnetic Technologies 489:Disk drive recording medium 97:/meter units and is denoted 34:, a soft magnetic material. 681:At the coercive field, the 148:. The latter are used in 1732: 1649:Journal of Applied Physics 1552:Journal of Applied Physics 1422:Journal of Applied Physics 1373:Journal of Applied Physics 1296:10.1016/j.jmmm.2006.04.029 1204:Journal of Applied Physics 1066:Orloff, Jon (2017-12-19). 994:Journal of Applied Physics 855:Journal of Applied Physics 324:Experimental determination 18: 1358:10.1109/TJMJ.1992.4565502 970:Dynamo-electric machinery 109:An analogous property in 21:Coercion (disambiguation) 1485:Kneller & Hawig 1991 637:or alternating-gradient 1587:Physica Status Solidi C 775:Magnetic susceptibility 585:Samarium-cobalt magnet 140:, and are used to make 1697:), at fujifilmusa.com. 1608:10.1002/pssc.200405476 1263:Chen & Nikles 2002 761:. Since the 1990s new 751:maximum energy product 687:magnetization reversal 629:loop, also called the 615:Samarium-cobalt magnet 197:ferromagnetic material 192: 184: 121:, is the ability of a 111:electrical engineering 59: 828:Tumanski, S. (2011). 190: 182: 29: 807:. Elsevier Science. 661:and is dominated by 274:remanence coercivity 246:intrinsic coercivity 1716:Magnetic hysteresis 1711:Physical quantities 1662:1981JAP....52.2544L 1631:1991ITM....27.3588K 1600:2004PSSCR...1.3440G 1565:1986JAP....59.4129G 1534:2002NanoL...2..211C 1434:1998JAP....84..368D 1385:1993JAP....73.6023R 1323:2001JMMM..224..233J 1288:2007JMMM..308...20B 1244:on 11 February 2015 1216:1993JAP....73.5751F 1181:1991ITM....27.5052Y 1045:1997ITM....33.3748Q 1006:1994JAP....75.5779M 867:1997JAP....81.4122A 659:thermally activated 631:magnetization curve 627:magnetic hysteresis 330: 119:electric coercivity 67:magnetic coercivity 1474:Genish et al. 2004 948:. Cartech.ides.com 759:Curie temperatures 755:rare-earth magnets 663:magnetic viscosity 460:2Fe:Co, iron pole 328: 311:rare-earth magnets 193: 185: 169:magnetic shielding 65:, also called the 60: 1639:10.1109/20.102931 1594:(12): 3440–3442. 1559:(12): 4129–4132. 1542:10.1021/nl015649w 1379:(10): 6023–6025. 1189:10.1109/20.278737 1114:10.1021/jp045554t 1053:10.1109/20.619559 814:978-0-08-053437-4 623: 622: 218:normal coercivity 142:permanent magnets 129:without becoming 115:materials science 85:without becoming 1723: 1673: 1670:10.1063/1.328996 1656:(3): 2541–2545. 1642: 1625:(4): 3588–3600. 1611: 1576: 1573:10.1063/1.336671 1545: 1518:nanoparticles". 1487: 1482: 1476: 1471: 1465: 1460: 1454: 1453: 1442:10.1063/1.368075 1413: 1407: 1406: 1401: 1393:10.1063/1.353457 1368: 1362: 1361: 1341: 1335: 1334: 1306: 1300: 1299: 1271: 1265: 1260: 1254: 1253: 1251: 1249: 1234: 1228: 1227: 1224:10.1063/1.353563 1199: 1193: 1192: 1175:(6): 5052–5054. 1160: 1154: 1153: 1151: 1149: 1140: 1132: 1126: 1125: 1097: 1091: 1090: 1088: 1086: 1063: 1057: 1056: 1039:(5): 3748–3750. 1024: 1018: 1017: 1014:10.1063/1.355560 988: 982: 981: 979: 977: 964: 958: 957: 955: 953: 942: 936: 935: 933: 931: 920: 909: 908: 906: 905: 896:. Archived from 885: 879: 878: 875:10.1063/1.365100 850: 844: 843: 825: 819: 818: 798: 744:magnetostriction 704:grain boundaries 683:vector component 635:vibrating-sample 602: 540: 512:Neodymium magnet 403:Electrical steel 331: 284: 256: 228: 195:Coercivity in a 105: 1731: 1730: 1726: 1725: 1724: 1722: 1721: 1720: 1701: 1700: 1681: 1676: 1645: 1614: 1583: 1579: 1548: 1517: 1506: 1500: 1494: 1490: 1483: 1479: 1472: 1468: 1461: 1457: 1415: 1414: 1410: 1399: 1370: 1369: 1365: 1352:(10): 798–804. 1343: 1342: 1338: 1308: 1307: 1303: 1273: 1272: 1268: 1261: 1257: 1247: 1245: 1236: 1235: 1231: 1201: 1200: 1196: 1162: 1161: 1157: 1147: 1145: 1138: 1134: 1133: 1129: 1099: 1098: 1094: 1084: 1082: 1080: 1065: 1064: 1060: 1026: 1025: 1021: 990: 989: 985: 975: 973: 966: 965: 961: 951: 949: 944: 943: 939: 929: 927: 922: 921: 912: 903: 901: 887: 886: 882: 852: 851: 847: 840: 827: 826: 822: 815: 800: 799: 792: 788: 771: 763:exchange spring 732: 679: 643:antiferromagnet 600: 586: 539: 535: 531: 490: 451: 447: 443: 439: 347: 338: 326: 319: 283: 277: 255: 249: 227: 221: 177: 161:recording heads 104: 98: 53: 40: 24: 17: 12: 11: 5: 1729: 1727: 1719: 1718: 1713: 1703: 1702: 1699: 1698: 1687: 1680: 1679:External links 1677: 1675: 1674: 1643: 1612: 1581: 1577: 1546: 1528:(3): 211–214. 1508: 1502: 1496: 1491: 1489: 1488: 1477: 1466: 1455: 1428:(1): 368–373. 1408: 1363: 1336: 1317:(3): 233–240. 1301: 1266: 1255: 1229: 1194: 1155: 1127: 1108:(5): 1919–22. 1092: 1078: 1058: 1019: 983: 959: 937: 910: 880: 845: 838: 820: 813: 789: 787: 784: 783: 782: 777: 770: 767: 731: 728: 678: 675: 621: 620: 617: 611: 610: 607: 582: 581: 578: 546: 545: 542: 519: 518: 515: 508: 507: 504: 486: 485: 482: 476: 475: 472: 465: 464: 461: 457: 456: 453: 449: 445: 441: 432: 431: 428: 421: 420: 417: 410: 409: 406: 399: 398: 395: 384: 383: 380: 365: 364: 361: 341: 340: 335: 325: 322: 317: 307: 306: 281: 270: 253: 242: 225: 201:magnetic field 176: 173: 127:electric field 102: 83:magnetic field 75:coercive force 71:coercive field 51: 38: 15: 13: 10: 9: 6: 4: 3: 2: 1728: 1717: 1714: 1712: 1709: 1708: 1706: 1696: 1692: 1688: 1686: 1683: 1682: 1678: 1671: 1667: 1663: 1659: 1655: 1651: 1650: 1644: 1640: 1636: 1632: 1628: 1624: 1620: 1619: 1613: 1609: 1605: 1601: 1597: 1593: 1589: 1588: 1578: 1574: 1570: 1566: 1562: 1558: 1554: 1553: 1547: 1543: 1539: 1535: 1531: 1527: 1523: 1522: 1516: 1512: 1505: 1499: 1493: 1492: 1486: 1481: 1478: 1475: 1470: 1467: 1464: 1459: 1456: 1451: 1447: 1443: 1439: 1435: 1431: 1427: 1423: 1419: 1412: 1409: 1404: 1398: 1394: 1390: 1386: 1382: 1378: 1374: 1367: 1364: 1359: 1355: 1351: 1347: 1340: 1337: 1332: 1328: 1324: 1320: 1316: 1312: 1305: 1302: 1297: 1293: 1289: 1285: 1281: 1277: 1270: 1267: 1264: 1259: 1256: 1243: 1239: 1233: 1230: 1225: 1221: 1217: 1213: 1209: 1205: 1198: 1195: 1190: 1186: 1182: 1178: 1174: 1170: 1166: 1159: 1156: 1144: 1137: 1131: 1128: 1123: 1119: 1115: 1111: 1107: 1103: 1096: 1093: 1081: 1079:9781420045550 1075: 1072:. 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Index

Coercion (disambiguation)

grain-oriented electrical steel
retentivity
ferromagnetic
magnetic field
demagnetized
oersted
ampere
electrical engineering
materials science
ferroelectric
electric field
depolarized
permanent magnets
transformer
inductor
cores
recording heads
microwave
magnetic shielding


ferromagnetic material
magnetic field
saturation
magnetic flux
magnetization
remanence
rare-earth magnets

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