Magento 2: How to Get sub category of current category in Magento2

<?php
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$category = $objectManager->get('Magento\Framework\Registry')->registry('current_category'); //Get Current Category
$subcats = $category->getChildrenCategories();
$_helper = $this->helper('Magento\Catalog\Helper\Output');
?>
<ul class="sub-cat">
<?php
foreach ($subcats as $subcat) {
$_category = $objectManager->create('Magento\Catalog\Model\Category')->load($subcat->getId());
$_outputhelper = $this->helper('Magento\Catalog\Helper\Output');
$subcaturl = $subcat->getUrl();
$_imgHtml = '';
if ($_imgUrl = $_category->getImageUrl()) {
$_imgHtml = '<img src="' . $_imgUrl . '" />';
$_imgHtml = $_outputhelper->categoryAttribute($_category, $_imgHtml, 'image');
/* @escapeNotVerified */} ?>
<li>
<div class="cat-image">
<a href="< ?php echo $subcaturl ?>">< ?php echo $_imgHtml;?></a>
</div>
<div class="info">
<h4>< ?php echo $subcat->getName(); ?></h4>
<a class="link" href="< ?php echo $subcaturl ?>">< ?php /* @escapeNotVerified */ echo __('View more') ?></a></div>
</li>
<?php } ?>
</ul>